MYCOGEN CORP
S-8, 1996-02-13
AGRICULTURAL SERVICES
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<PAGE>
 
   As filed with the Securities and Exchange Commission on February 13, 1996
                    Registration No. 33-__________________

================================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549

                                   FORM S-8
                         REGISTRATION STATEMENT UNDER
                          THE SECURITIES ACT OF 1933
                                        
                              MYCOGEN CORPORATION
       -----------------------------------------------------------------
            (Exact name of registrant as specified in its charter)

           California                                     95-3802654
- --------------------------------                   ----------------------
(State or other jurisdiction of                       (I.R.S. Employer
 incorporation or organization)                      Identification No.)


5501 Oberlin Drive,  San Diego, California                  92121
- ------------------------------------------               -----------
 (Address of principal executive offices)                 (Zip Code)

                                        
                       1995 EMPLOYEE STOCK PURCHASE PLAN
                    --------------------------------------
                           (Full title of the plan)


                                CARLTON J. EIBL
               President, Chief Operating Officer and Secretary
               5501 Oberlin Drive,  San Diego, California  92121
             ----------------------------------------------------
                    (Name and address of agent for service)
                     
                   
                                 619-453-8030
                                 ------------
         (Telephone number, including area code, of agent for service)

                     ------------------------------------

         This Registration Statement shall become effective immediately
            upon filing with the Securities and Exchange Commission,
          and sales of the registered securities will begin as soon as
               reasonably practicable after such effective date.

                     ------------------------------------
<PAGE>
 
                        CALCULATION OF REGISTRATION FEE
<TABLE> 
<CAPTION>
Title of securities     Amount to be         Proposed maximum            Proposed maximum           Amount of
to be registered         registered      offering price per share    aggregate offering price    registration fee
- -----------------------------------------------------------------------------------------------------------------
<S>                     <C>              <C>                         <C>                         <C> 
Common Stock,            250,000 (1)            $16.00 (2)                $4,000,000 (2)             $1,379.31
$.001 par value
</TABLE> 
- ------------
(1)  This Registration Statement shall also cover any additional shares of
Common Stock which become issuable under the 1995 Employee Stock Purchase Plan
by reason of any stock dividend, stock split, recapitalization or other similar
transaction effected without the receipt of consideration which results in an
increase in the number of the Registrant's outstanding shares of Common Stock.

(2)  Calculated solely for purposes of this offering under rule 457 (h) of the
Securities Act of 1933, as amended, on the basis of the last sale reported per
share of Common Stock of Mycogen Corporation on February 7, 1996, as reported on
the NASDAQ National Market System.

                                       2
<PAGE>
 
Item 3.  Incorporation Of Certain Documents By Reference.
         ------------------------------------------------

     Mycogen Corporation (the "Registrant") hereby incorporates by reference
into this Registration Statement the following documents previously filed with
the Securities and Exchange Commission (the "Commission"):

     (a)  the Registrant's Annual Report on Form 10-K for the fiscal year ended
August 31, 1995, filed by the Registrant on November 3, 1995;

     (b)   (1)  The Registrant's Quarterly Report on Form 10-Q for the quarterly
period ended November 30, 1995, filed by the Registrant on January 16, 1996;

           (2) The Registrant's report on Form 8-K, filed with the Commission on
November 27, 1995;

     (c)  The Registrant's Registration Statement No. 0-15881 on Form 8-A filed
with the Commission on May 7, 1992, in which there is described the terms,
rights and provisions applicable to the Registrant's Common Stock.

     All reports and definitive proxy or information statements filed pursuant
to Section 13(a), 13(c), 14 or 15(d) of the 1934 Act after the date of this
Registration Statement and prior to the filing of a post-effective amendment
which indicates that all securities offered hereby have been sold or which
deregisters all securities then remaining unsold shall be deemed to be
incorporated by reference into this Registration Statement and to be a part
hereof from the date of filling of such documents.


Item 4.  Description of Securities.
         --------------------------

     Not applicable.


Item 5.  Interests of Named Experts and Counsel.
         ---------------------------------------

     Registrant's President has delivered to Registrant a legal opinion as to
the validity of the issuance of Common Stock under this Registration Statement.


Item 6.  Indemnification of Directors and Officers.
         ------------------------------------------

     The California General Corporation Law provides that directors will not be
liable to the Registrant for monetary damages arising from a breach of their
fiduciary duty as directors in certain circumstances, including such conduct
during a merger or tender offer.  Such limitation does not affect liability for
any breach of a director's duty to the Registrant or its shareholders (i) with
respect to approval by the director of any transaction from which he or she
derives an

                                       3
<PAGE>
 
improper personal benefit; (ii) with respect to any acts or omissions involving
an absence of good faith, which he or she believes to be contrary to the best
interests of the Company or its shareholders, which involve intentional
misconduct or a knowing and culpable violation of law, which constitute an
unexcused pattern of inattention that amounts to an abdication of his or her
duty to the Registrant or its shareholders, or which show a reckless disregard
for his or her duty to the Registrant or its shareholders in circumstances in
which he or she was, or should have been, aware, in the ordinary course of
performing his or her duties, of a risk of serious injury to the Registrant or
its shareholders; or (iii) based on transactions between the Registrant and its
directors or another corporation with interrelated directors, or on improper
distributions, loans or guarantees under applicable sections of the California
Corporations Code. In addition, such limitation of liability does not affect the
availability of equitable remedies such as injunctive relief or rescission,
although in certain circumstances equitable relief may not be available as a
practical matter. Such limitation may relieve the directors of monetary
liability to the Registrant for grossly negligent conduct, including conduct in
situations involving attempted takeovers of the Registrant. No claim or
litigation is currently pending against the Registrant's directors that would be
affected by such limitation of liability.

     Article X of the Articles of Incorporation of the Registrant and Article V
of the Registrant's Bylaws provide for indemnification of its directors,
officers and other agents to the maximum extent permitted by the California
Corporations Code.  The Registrant maintains insurance for the benefit of its
current directors and officers that insures such persons against certain
liabilities, including liabilities under the securities laws.  The Registrant
has entered into an indemnification agreement with each of its current directors
and executive officers whereby the Registrant will reimburse its current
directors and such officers against certain liabilities, including liabilities
arising under the securities laws.

Item 7.  Exception from Registration Claimed.
         ------------------------------------

     Not applicable.

Item 8.  Exhibits.
         ---------

Exhibit
Number         Exhibit
- ------         -------

  5            Opinion and Consent of Carlton J. Eibl, Esq.

 10.1          1995 Employee Stock Purchase Plan

 10.2          Employee Stock Purchase Plan Summary and Prospectus

 23            Consent of Ernst & Young LLP, Independent Auditors

 24            Power of Attorney

                                       4
<PAGE>
 
Item 9.  Undertakings.
         -------------

     A.   The undersigned Registrant hereby undertakes:  (1) to file, during any
period in which offers or sales are being made, a post-effective amendment to
this Registration Statement (i) to include any prospectus required by Section
10(a)(3) of the Securities Act of 1933; (ii) to reflect in the prospectus any
facts or events arising after the effective date of this Registration Statement
(or the most recent post-effective amendment thereof) which, individually or in
the aggregate, represent a fundamental change in the information set forth in
this Registration Statement; and (iii) to include any material information with
respect to the plan of distribution not previously disclosed in this
Registration Statement or any material change to such information in this
Registration Statement; provided, however, that clauses (1)(i) and (1)(ii) shall
                        --------
not apply if the information required to be included in a post-effective
amendment by those paragraphs is contained in periodic reports filed by the
Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange
Act of 1934 that are incorporated by reference into this Registration Statement;
(2) that for the purpose of determining any liability under the Securities Act
of 1933 each such post-effective amendment will be deemed to be a new
registration statement relating to the securities offered therein and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof; and (3) to remove from registration by means of a post-
effective amendment any of the securities being registered which remain unsold
upon the termination of the 1995 Employee Stock Purchase Plan.

     B.   The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 that is incorporated by reference into this
Registration Statement will be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

     C.   Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers or controlling
persons of the Registrant pursuant to the indemnity provisions incorporated by
reference in Item 6, or otherwise, the Registrant has been informed that in the
opinion of the Commission such indemnification is against public policy as
expressed in the 1933 Act and is, therefore, unenforceable.  In the event that a
claim for indemnification against such liabilities (other than the payment by
the Registrant of expenses incurred or paid by a director, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the 1933 Act
and will be governed by the final adjudication of such issue.

                                       5
<PAGE>
 
                                   SIGNATURES
                                   ----------
                                        
     Pursuant to the requirements of the 1933 Act, the Registrant certifies that
it has reasonable grounds to believe that it meets all of the requirements for
filing on Form S-8 and has duly caused this Registration Statement to be signed
on its behalf by the undersigned, thereunto duly authorized, in the City of San
Diego, State of California, on this 9th day of February, 1996.

                                    MYCOGEN CORPORATION

Date:  February 9, 1996             By  /s/ Jerry Caulder
       --------------------             ------------------------------- 
                                        Jerry Caulder, Chairman and
                                        Chief Executive Officer

     Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed below by the following persons in the
capacities and on the date indicated.
<TABLE>

<S>                        <C>                                  <C>
    /s/ Jerry Caulder      Chairman, Chief Executive
- -------------------------  Officer and Director (Principal      February 9, 1996
     (Jerry Caulder)       Executive Officer)


  /s/ James A. Baumker
- -------------------------  Director                             February 9, 1996
   (Thomas J. Cable*)


  /s/ James A. Baumker
- -------------------------  Director                             February 9, 1996
   (George R. Hill*)


  /s/ James A. Baumker
- -------------------------  Director                             February 9, 1996
  (Kenneth H. Hopping)


  /s/ James A. Baumker
- -------------------------  Director                             February 9, 1996
   (David H. Rammler*)


  /s/ James A. Baumker
- -------------------------  Director                             February 9, 1996
  (A. John Speziale*)


  /s/ James A. Baumker     Vice President and Chief
- -------------------------  Financial Officer (Principal         February 9, 1996
   (James A. Baumker)      Financial and Accounting Officer)
</TABLE>

*  By James A. Baumker under power of attorney.

                                       6
<PAGE>
 
                                 EXHIBIT INDEX

Exhibit
Number         Exhibit
- ------         -------

  5            Opinion and Consent of Carlton J. Eibl, Esq.

 10.1          1995 Employee Stock Purchase Plan

 10.2          Employee Stock Purchase Plan Summary and Prospectus

 23            Consent of Ernst & Young LLP, Independent Auditors

 24            Power of Attorney

                                       7

<PAGE>
 
                                                                       EXHIBIT 5

                             Opinion and Consent of
                                Carlton J. Eibl,
          President and Chief Operating Officer of Mycogen Corporation
<PAGE>
 
February 9, 1996


Mycogen Corporation
5501 Oberlin Drive
San Diego, CA   92121

Ladies and Gentlemen:

     I have acted as counsel to Mycogen Corporation, a California corporation,
(the "Company") with respect to certain matters in connection with the filing by
the Company of a Registration Statement on Form S-8 (the "Registration
Statement") with the Securities and Exchange Commission (the "Commission") for
(i) an aggregate of 250,000 shares of Common Stock, $.001 par value, reserved
for issuance under the Company's 1995 Employee Stock Purchase Plan (the
"Registered Shares").

     In connection with this opinion, I have examined, issued and relied upon
the Registration Statement No. 0-15881 on Form 8-A filed by the Company with the
Commission on May 7, 1992, the Company's Articles of Incorporation and Bylaws,
as amended, and the originals or copies certified to my satisfaction, of such
records, documents, certificates, memoranda, and other instruments as in my
judgment is necessary or appropriate to enable me to render the opinion
expressed below.

     On the basis of the foregoing, and in reliance thereon, I am of the opinion
that the Registered Shares, when sold and issued in accordance with the
Registration Statement and related prospectus, will be validly issued, fully
paid and nonassessable.

     I consent to the filing of this opinion as Exhibit 5 to this Registration
Statement.

                              Very truly yours,

                               /s/ Carlton J. Eibl

                              Carlton J. Eibl
                              President and Chief Operating Officer

<PAGE>
 
                                                                    EXHIBIT 10.1

                       1995 Employee Stock Purchase Plan


                              MYCOGEN CORPORATION
                       1995 EMPLOYEE STOCK PURCHASE PLAN
                       ---------------------------------

I.   PURPOSE OF THE PLAN

     This Employee Stock Purchase Plan is intended to promote the interests of
MYCOGEN CORPORATION by providing eligible employees with the opportunity to
acquire a proprietary interest in the Corporation through participation in a
payroll-deduction based employee stock purchase plan.

     Capitalized terms herein shall have the meanings assigned to such terms in
the attached Appendix.

II.  ADMINISTRATION OF THE PLAN

     The Compensation Committee of the Board in its capacity as Plan
Administrator shall have full authority to interpret and construe any provision
of the Plan and to adopt such rules and regulations for proper administration of
the Plan as it may deem necessary or appropriate.  Decisions of the Plan
Administrator shall be final and binding on all parties having an interest in
the Plan.

III. STOCK SUBJECT TO PLAN
 
     A.   The stock purchasable under the Plan shall be shares of authorized but
          unissued or reacquired Common Stock, including shares of Common Stock
          purchased on the open market.  the maximum number of shares of Common
          Stock which may be issued over the term of the plan shall not exceed
          250,000 shares.  Such authorized share reserve is comprised of (i) the
          estimated number of shares (184,000 shares) which will remain
          available for issuance under the Predecessor Plan following the
          November 30, 1995 purchase date thereunder plus (ii) an additional
          increase of approximately 66,000 shares.
 
     B.   Should any change be made to the Common Stock by reason of any stock
          split, stock dividend, recapitalization, combination of shares,
          exchange of shares or other change affecting the outstanding Common
          Stock as a class without the Corporation's receipt of consideration,
          appropriate adjustments shall be made to (i) the maximum number and
          class of securities issuable under the Plan, (ii) the maximum number
          and class of securities purchasable per Participant on any one
          Purchase Date and (iii) the number and class of securities and the
          price per share in effect under each outstanding purchase right in
          order to prevent the dilution or enlargement of benefits thereunder.

IV.  PURCHASE PERIODS
 
     A.   Shares of Common Stock shall be offered for purchase under the Plan
          through a series of successive Purchase Periods until such time as (i)
          the maximum number of shares of Common Stock available for issuance
          under the Plan shall have been purchased or (ii) the Plan shall have
          been sooner terminated.
 
     B.   Each Purchase Period shall be of six (6) months duration.  The initial
          Purchase Period shall commence on the Effective Date and shall end on
          the last business day in May 1996.  Subsequent Purchase Periods shall
          run from the first business day in June to the last business day in
          November each year and from the first business day of December each
          year to the last business day of May in the succeeding year.
 
     C.   Under no circumstances shall any shares of Common Stock be issued
          under the Purchase Plan until such time as (i) the Plan shall have
          been approved by the Corporation's stockholders and (ii) the
          Corporation shall have complied with all applicable requirements of
          the Securities Act, all applicable listing requirements of any
          securities exchange (or the NASDAQ National Market if applicable) on
          which shares of the Common Stock are listed for trading and all other
          applicable statutory and regulatory requirements.
<PAGE>
 
V.   ELIGIBILITY
 
     A.   Each Eligible Employee may commence participation in the Plan on the
          start date of any Purchase Period coincident with or subsequent to his
          or her completion of one month of continuous service with the
          Corporation or any Corporate Affiliate, provided he or she remains an
          Eligible Employee on such start date.
 
     B.   To participate in the Plan for a particular Purchase Period, the
          Eligible Employee must complete the enrollment forms prescribed by the
          Plan Administrator (including a stock purchase agreement and a payroll
          deduction authorization form) and file such forms with the Plan
          Administrator (or its designate) prior to the start date of that
          Purchase Period.
 
VI.  PAYROLL DEDUCTIONS
 
     A.   The payroll deduction authorized by the Participant for purposes of
          acquiring shares of Common Stock under the Plan may be any multiple of
          one percent (1%) of the Base Salary paid to the Participant during the
          Purchase Period, up to a maximum of fifteen percent (15%).  the
          deduction rate so authorized shall continue in effect from Purchase
          Period to Purchase Period.  However, the Participant may, prior to the
          commencement of any new Purchase Period, increase or decrease the rate
          of his or her payroll deduction by filing the appropriate form with
          the Plan Administrator prior to the start date of that Purchase
          Period.  The new rate (which may not exceed the fifteen percent (15%)
          maximum) shall become effective as of the start date of the first
          Purchase Period following the filing of such form.
 
     B.   Payroll deductions shall begin on the first pay day following the
          start date of the Purchase Period and shall (unless sooner terminated
          by the Participant) continue through the pay day ending with or
          immediately prior to the last day of that Purchase Period.  The
          amounts so collected shall be credited to the Participant's book
          account under the Plan, but no interest shall be paid on the balance
          from time to time outstanding in such account.  The amounts collected
          from the Participant shall not be held in any segregated account or
          trust fund and may be commingled with the general assets of the
          Corporation and used for general corporate purposes.
 
     C.   Payroll deductions shall automatically cease upon the termination of
          the Participant's purchase right in accordance with the provisions of
          the Plan.
 
     D.   The Participant's acquisition of Common Stock under the Plan on any
          Purchase Date shall neither limit nor require the Participant's
          acquisition of Common Stock on any subsequent Purchase Date.
 
VII.  PURCHASE RIGHTS
 
     A.   GRANT OF PURCHASE RIGHT.  A Participant shall be granted a separate
          -----------------------
          purchase right for each Purchase Period in which he or she
          participates.  The purchase right shall be granted on the start date
          of the Purchase Period and shall provide the Participant with the
          right to purchase shares of Common Stock upon the terms set forth
          below.  The Participant shall execute a stock purchase agreement
          embodying such terms and such other provisions (not inconsistent with
          the Plan) as the Plan Administrator may deem advisable.

          Under no circumstances shall purchase rights be granted under the Plan
          to any Eligible Employee if such individual would, immediately after
          the grant, own (within the meaning of Code Section 424(d)) or hold
          outstanding options or other rights to purchase, stock possessing five
          percent (5%) or more of the total combined voting power or value of
          all classes of stock of the Corporation or any Corporate Affiliate.
<PAGE>
 
     B.   EXERCISE OF THE PURCHASE RIGHT.  Each purchase right shall be
          ------------------------------
          automatically exercised on the last day of the Purchase Period by
          applying the Participant's payroll deductions for that Purchase Period
          to the purchase of whole shares of Common Stock at the purchase price
          in effect for the Purchase Period.
 
     C.   PURCHASE PRICE.  The purchase price per share at which Common Stock
          --------------
          will be purchased on the Participant's behalf on the last day of each
          Purchase Period shall be equal to eighty-five percent (85%) of the
          lower of (i) the Fair Market Value per share of Common Stock on the
          -----
          last business day immediately preceding the start date of that
          Purchase Period or (ii) the Fair Market Value per share of Common
          Stock on the Purchase Date.
 
     D.   NUMBER OF PURCHASABLE SHARES.  The number of shares of Common Stock
          ----------------------------
          purchasable per Participant at the end of each Purchase Period shall
          be the number of whole shares obtained by dividing the amount
          collected from the Participant through payroll deductions during the
          Purchase Period by the purchase price in effect for that Purchase
          Period. However, the maximum number of shares of Common Stock
          purchasable per Participant on any one Purchase Date shall not exceed
          Three Hundred Seventy-Five (375) shares, subject to periodic
          adjustments in the event of certain changes in the Corporation's
          capitalization.
 
     E.   EXCESS PAYROLL DEDUCTIONS.  Any payroll deductions not applied to the
          -------------------------
          purchase of shares of Common Stock at the end of any Purchase Period
          because they are not sufficient to purchase a whole share of Common
          Stock shall be held for the purchase of Common Stock on the next
          Purchase Date.  However, any payroll deductions not applied to the
          purchase of Common Stock by reason of the limitation on the maximum
          number of shares which the Participant may purchase on any one
          Purchase Date shall be promptly refunded.
 
     F.   TERMINATION OF PURCHASE RIGHT.  The following provisions shall govern
          -----------------------------
          the termination of outstanding purchase rights:

            (I.)   A Participant may, at any time prior to the last day of the
                   Purchase Period, terminate his or her outstanding purchase
                   right by filing the appropriate form with the Plan
                   Administrator (or its designate), and no further payroll
                   deductions shall be collected from the Participant with
                   respect to the terminated purchase right. Any payroll
                   deductions collected on the Participant's behalf during the
                   Purchase Period in which such termination occurs shall be
                   held for the purchase of shares at the end of that Purchase
                   Period.

            (II.)  The termination of such purchase right shall be irrevocable,
                   and the Participant may not subsequently rejoin the Purchase
                   Period for which the terminated purchase right was granted.
                   In order to resume participation in any subsequent Purchase
                   Period, such individual must re-enroll in the Plan (by making
                   a timely filing of the prescribed enrollment forms) prior to
                   the start date of that Purchase Period.
 
            (III.) A Participant's purchase right shall immediately terminate
                   upon his or her cessation of Eligible Employee status for any
                   reason (other than death or Disability), and the payroll
                   deductions collected on behalf of the Participant pursuant to
                   the terminated purchase right shall be promptly refunded.

            (IV.)  Should the Participant cease to remain an Eligible Employee 
                   by reason of death or Disability while his or her purchase
                   right remains outstanding, then such individual (or the
                   personal representative of the estate of a deceased
                   Participant) shall have the following election, exercisable
                   up until the end of the Purchase Period in which such
                   cessation of Eligible Employee status occurs:

                   . to withdraw all of the payroll deductions collected to date
                     on the Participant's behalf during that Purchase Period or

                   . to have such funds held for the purchase of shares at the
                     end of that Purchase Period.

                   In the absence of such a timely election, the Participant's
                   payroll deductions shall be refunded as soon as possible
                   after the close of the Purchase Period.

<PAGE>
 
            (V.)   In no event may any payroll deductions be made on the
                   Participant's behalf following his/her cessation of Eligible
                   Employee status.

            (VI.)  Should the Participant cease to remain in active service by
                   reason of an approved unpaid leave of absence, then the
                   Participant shall have the election, exercisable up until the
                   last business day of the Purchase Period in which such leave
                   commences, to (a) withdraw all the payroll deductions
                   collected to date on the Participant's behalf during that
                   Purchase Period or (b) have such funds held for the purchase
                   of shares at the end of such Purchase Period. In no event,
                   however, shall any further payroll deductions be collected on
                   the Participant's behalf during such unpaid leave. Upon the
                   Participant's return to active service, his or her payroll
                   deductions under the Plan shall automatically resume at the
                   rate in effect at the time the leave began, provided the
                   Participant returns to service prior to the expiration date
                   of the Purchase Period in which such leave began.
                   
     G.   CHANGE IN CONTROL.  Each outstanding purchase right shall
          -----------------
          automatically be exercised, immediately prior to the effective date of
          any Change in Control, by applying the payroll deductions of each
          Participant for the Purchase Period in which such Change in Control
          occurs to the purchase of whole shares of Common Stock at a purchase
          price per share equal to eighty-five percent (85%) of the lower of (i)
                                                                    -----
          the Fair Market Value per share of Common Stock on the last business
          day immediately preceding the start date of the Purchase Period in
          which such Change in Control occurs or (ii) the Fair Market Value per
          share of Common Stock immediately prior to the effective date of such
          Change in Control.
 
     H.   PRORATION OF PURCHASE RIGHTS.  Should the total number of shares of
          ----------------------------
          Common Stock to be purchased pursuant to outstanding purchase rights
          on any particular date exceed the number of shares then available for
          issuance under the Plan, the Plan Administrator shall make a pro-rata
          allocation of the available shares on a uniform and nondiscriminatory
          basis, and the payroll deductions of each Participant, to the extent
          in excess of the aggregate purchase price payable for the Common Stock
          pro-rated to such individual, shall be refunded.
 
     I.   ASSIGNABILITY.  No purchase right granted under the Plan shall be
          -------------
          assignable or transferable by the Participant other than by will or by
          the laws of descent and distribution following the Participant's
          death, and during the Participant's lifetime the purchase right shall
          be exercisable only by the Participant.
 
     J.   STOCKHOLDER RIGHTS.  A Participant shall have no stockholder rights
          ------------------
          with respect to the shares subject to his or her outstanding purchase
          right until the shares are purchased on the Participant's behalf in
          accordance with the provisions of the Plan and the Participant has
          become a holder of record of the purchased shares.

     A Participant shall be issued, as soon as practicable after the end of each
Purchase Period, a statement showing the number of shares purchased on the
Participant's behalf for that Purchase Period and the purchase price paid per
share.  The Participant may at any time request the issuance of a stock
certificate for any shares purchased on his or her behalf under the Plan.
However, not more than one certificate shall be issued per Participant for each
Purchase Period of participation in the Plan, and such certificate may, upon the
Participant's request, be issued in the names of the Participant and his or her
spouse as community property or as joint tenants with right of survivorship.
Alternatively, the stock certificate may be delivered to a designated stock
brokerage account maintained for the Participant and held in "street name" in
order to facilitate the subsequent sale of the purchased shares.

VIII.  ACCRUAL LIMITATIONS
 
     A.   No Participant shall be entitled to accrue rights to acquire Common
          Stock pursuant to any purchase right outstanding under this Plan if
          and to the extent such accrual, when aggregated with (i) rights to
          purchase Common Stock accrued under any other purchase right granted
          under this Plan and (ii) similar rights accrued under other employee
          stock purchase plans (within the meaning of Code Section 423) of the
          Corporation or any Corporate Affiliate, would otherwise permit such
          Participant to purchase more than Twenty-Five Thousand Dollars
          ($25,000) worth of stock of the Corporation or any Corporate Affiliate
          (determined on the basis of the Fair Market Value of such stock on the
          date or dates such rights are granted) for each calendar year such
          rights are at any time outstanding.
<PAGE>
 
     B.   For purposes of applying such accrual limitations to the purchase
          rights granted under this Plan, the following provisions shall be in
          effect:
 
            (I.)  The right to acquire Common Stock under each outstanding 
                  purchase right shall accrue on the last day of the Purchase
                  Period for which such right is granted.
                   
 
            (II.) No right to acquire Common Stock under any outstanding 
                  purchase right under the Plan shall accrue to the extent the
                  Participant has already accrued in the same calendar year the
                  right to acquire Common Stock under one (1) or more other
                  purchase rights at a rate equal to Twenty-Five Thousand
                  Dollars ($25,000) worth of Common Stock (determined on the
                  basis of the Fair Market Value of such stock on the date or
                  dates of grant) for each calendar year such rights were at any
                  time outstanding.

     C.   If by reason of such accrual limitations, any purchase right of a
          Participant does not accrue for a particular Purchase Period, then the
          payroll deductions collected on the Participant's behalf with respect
          to that purchase right shall be promptly refunded.
 
     D.   In the event there is any conflict between the provisions of this
          Article and one or more provisions of the Plan or any instrument
          issued thereunder, the provisions of this Article shall be
          controlling.
 
IX.  EFFECTIVE DATE AND TERM OF THE PLAN
 
     A.   The Plan was adopted by the Board on October 19, 1995 and shall become
          effective on the Effective date, provided the Plan is approved by the
                                           --------
          Corporation's stockholders at the 1995 Annual Meeting.  The Plan is
          intended to be the successor to the Predecessor Plan, and should such
          stockholder approval be obtained, the Predecessor Plan, together with
          all outstanding purchase rights thereunder, shall terminate with the
          November 30, 1995 quarterly purchase date thereunder, and no more
          purchase rights shall be granted or exercised and no shares of Common
          Stock shall be issued under the Predecessor Plan after the November
          30, 1995 purchase date.  In the event such stockholder approval is not
          obtained, then this Plan shall not be implemented, and the Predecessor
          Plan shall continue in full force and effect with its existing terms
          and provisions.
 
     B.   Unless sooner terminated by the Board, the Plan shall terminate upon
          the earliest of (i) the last business day in November 2005, (ii) the
              --------
          date on which all shares available for issuance under the Plan shall
          have been sold pursuant to purchase rights exercised under the Plan or
          (iii) the date on which all purchase rights are exercised in
          connection with a Change in Control. No further purchase rights shall
          be granted or exercised, and no further payroll deductions shall be
          collected, under the Plan following such termination.
 
 
X.   AMENDMENT OF THE PLAN

     The Board may alter, amend, suspend or discontinue the Plan at any time to
become effective immediately following the close of any Purchase Period.
However, the Board may not, without the approval of the Corporation's
stockholders, (i) materially increase the number of shares of Common Stock
issuable under the Plan or the maximum number of shares purchasable per
Participant at the end of each Purchase Period, except for permissible
adjustments in the event of certain changes in the Corporation's capitalization,
(ii) alter the purchase price formula so as to reduce the purchase price payable
for the shares of Common Stock purchasable under the Plan, or (iii) materially
increase the benefits accruing to Participants under the Plan or materially
modify the requirements for eligibility to participate in the Plan.

XI.  GENERAL PROVISIONS

     A.   The Plan shall NOT be administered as a qualified employee stock
          purchase plan under Code Section 423.  Accordingly, each Participant
          shall, in connection with his or her purchases of Common Stock under
          the Plan, satisfy all applicable federal, state and local income and
          employment tax withholding requirements.
<PAGE>
 
     B.   All costs and expenses incurred in the administration of the Plan
          shall be paid by the Corporation.

     C.   Nothing in the Plan shall confer upon the Participant any right to
          continue in the employ of the Corporation or any Corporate Affiliate
          for any period of specific duration or interfere with or otherwise
          restrict in any way the rights of the Corporation (or any Corporate
          Affiliate employing such person) or of the Participant, which rights
          are hereby expressly reserved by each, to terminate such person's
          employment at any time for any reason, with or without cause.

     D.   The provisions of the Plan shall be governed by the laws of the State
          of California without resort to that State's conflict-of-laws rules.
<PAGE>
 
                                   SCHEDULE A
                                   ----------

                         CORPORATIONS PARTICIPATING IN
                          EMPLOYEE STOCK PURCHASE PLAN
                            AS OF THE EFFECTIVE DATE
                            ------------------------

 
                Mycogen Corporation
                Mycogen Plant Sciences
                Mycogen Crop Protection
                Mycogen Canada, Inc.
                Mycogen Plant Sciences Puerto Rico Corporation
<PAGE>
 
                                    APPENDIX
                                    --------

The following definitions shall be in effect under the Plan:

     A.   BASE SALARY shall mean the (i) regular base salary paid to a
          -----------
          Participant by one or more Participating Companies during such
          individual's period of participation in the Plan plus (ii) any pre-tax
          contributions made by the Participant to any Code Section 401(k)
          salary deferral plan or any Code Section 125 cafeteria benefit program
          now or hereafter established by the Corporation or any Corporate
          Affiliate. Base Salary shall NOT include overtime payments, bonuses,
          commissions, profit-sharing distributions or other incentive-type
          payments, or any contributions (other than Code Section 401(k) or Code
          Section 125 contributions) made on the Participant's behalf by the
          Corporation or any Corporate Affiliate to any deferred compensation
          plan or welfare benefit program now or hereafter established.
 
     B.   BOARD shall mean the Corporation's Board of Directors.
          -----
 
     C.   CHANGE IN CONTROL shall mean a change in ownership or control of the
          -----------------
          Corporation effected through any of the following transactions:

            (I.)   a merger or consolidation in which securities possessing more
                   than fifty percent (50%) of the total combined voting power
                   of the Corporation's outstanding securities are transferred
                   to a person or persons different from the persons holding
                   those securities immediately prior to such transaction, or
                   
            (II.)  the sale, transfer or other disposition of all or 
                   substantially all of the assets of the Corporation in
                   complete liquidation or dissolution of the Corporation, or

            (III.) the acquisition by any person or group of related persons
                   (other than the Corporation or any person controlled by,
                   controlling or under common control with the Corporation) of
                   beneficial ownership of securities possessing more than fifty
                   percent (50%) of the total combined voting power of the
                   Corporation's outstanding securities pursuant to a tender or
                   exchange offer made directly to the Corporation's
                   stockholders.

     D.   CODE shall mean the Internal Revenue Code of 1986, as amended.
          ----
 
     E.   COMMON STOCK shall mean the Corporation's common stock.
          ------------
 
     F.   CORPORATE AFFILIATE shall mean any parent or subsidiary corporation of
          -------------------
          the Corporation (as determined in accordance with Code Section 424),
          whether now existing or subsequently established.
 
     G.   CORPORATION shall mean Mycogen Corporation, a California corporation,
          -----------
          and any corporate successor to all or substantially all of the assets
          or voting stock of Mycogen Corporation which shall by appropriate
          action adopt the Plan.
 
     H.   DISABILITY shall mean the Participant's inability, by reason of any
          ----------
          medically determinable physical or mental impairment expected to
          result in death or to be of continuous duration of twelve (12) months
          or more, to engage in any substantial gainful employment.
 
     I.   EFFECTIVE DATE shall mean December 1, 1995.  Any Corporate Affiliate
          --------------
          which becomes a Participating Corporation after such Effective Date
          shall designate a subsequent Effective Date with respect to its
          employee-Participants.
 
     J.   ELIGIBLE EMPLOYEE shall mean any person expected on a regularly-
          -----------------
          scheduled basis expected to work than twenty (20) hours per week for
          more than five (5) months per calendar year in the employ of any
          Participating Corporation for earnings considered wages under Code
          Section 3401(a).
 
     K.   FAIR MARKET VALUE per share of Common Stock on any relevant date shall
          -----------------
          be determined in accordance with the following provisions:
<PAGE>
 
            (I.)   If the Common Stock is at the time traded on the NASDAQ
                   National Market, then the Fair Market Value shall be the
                   closing selling price per share of Common Stock on the date
                   in question, as such price is reported by the National
                   Association of Securities Dealers on the NASDAQ National
                   Market or any successor system. If there is no closing
                   selling price for the Common Stock on the date in question,
                   then the Fair Market Value shall be the closing selling price
                   on the last preceding date for which such quotation exists.

            (II.)  If the Common Stock is at the time listed on any Stock 
                   Exchange, then the Fair Market Value shall be the closing
                   selling price per share on the date in question on the Stock
                   Exchange determined by the Plan Administrator to be the
                   primary market for the Common Stock, as such price is
                   officially quoted in the composite tape of transactions on
                   such exchange. If there is no closing selling price for the
                   Common Stock on the date in question, then the Fair Market
                   Value shall be the closing selling price on the last
                   preceding date for which such quotation exists.

     L.   PARTICIPANT shall mean any Eligible Employee of a Participating
          -----------
          Corporation who is actively participating in the Plan.
 
     M.   PARTICIPATING CORPORATION shall mean the Corporation and such
          -------------------------
          Corporate Affiliate or Affiliates as may be authorized from time to
          time by the Board to extend the benefits of the Plan to their Eligible
          Employees.  The Participating Corporations in the Plan as of the
          Effective Date are listed in attached Schedule A.
 
     N.   PLAN shall mean the Corporation's 1995 Employee Stock Purchase Plan,
          ----
          as set forth in this document.
 
     O.   PLAN ADMINISTRATOR shall mean the Compensation Committee of the Board
          ------------------
          in its capacity as administrator of the Plan.
 
     P.   PREDECESSOR PLAN shall mean the Corporation's existing Employee Stock
          ----------------
          Purchase Plan.
 
     Q.   PURCHASE PERIOD shall mean each successive six (6) month period at the
          ---------------
          end of which there shall be purchased shares of Common Stock on behalf
          of each Participant.
 
     R.   PURCHASE DATE shall mean the last business day of each Purchase Period
          -------------
          and shall accordingly occur on the last business day of May and
          November each year.
 
     S.   SECURITIES ACT shall mean the Securities Act of 1933, as amended.
          --------------
 
     T.   STOCK EXCHANGE shall mean either the American Stock Exchange or the
          --------------
          New York Stock Exchange.

<PAGE>
 
                                                                    EXHIBIT 10.2

              Employee Stock Purchase Plan Summary and Prospectus




                              MYCOGEN CORPORATION


 
                        ------------------------------

                          EMPLOYEE STOCK PURCHASE PLAN

                          PLAN SUMMARY AND PROSPECTUS

                        ------------------------------



                                 The date of this Prospectus is December 1, 1995


                               TABLE OF CONTENTS
                               -----------------


<TABLE> 
<CAPTION> 
                                                                                                PAGE
                                                                                                ----
<S>                                                                                             <C> 
INFORMATION ON THE 1995 EMPLOYEE STOCK PURCHASE PLAN............................................   1
</TABLE> 
<PAGE>
 
<TABLE> 
<S>                                                                                             <C> 
QUESTIONS AND ANSWERS ABOUT THE PURCHASE PLAN...................................................   1
  1. What is the purpose of the Purchase Plan?..................................................   1
  2. When will the new Purchase Plan become effective?..........................................   1
  3. What happens to my outstanding purchase rights under the Predecessor Plan?.................   1
  4. Who administers the Purchase Plan?.........................................................   1
  5. How many shares of Common Stock may be issued under the Purchase Plan?.....................   1
  6. How will the Common Stock be made available for purchase?..................................   2
  7. Who is eligible to participate in the Purchase Plan?.......................................   2
  8. When may I become a participant?...........................................................   2
  9. How do I become a participant?.............................................................   2
 10. How much may I invest through the Purchase Plan?...........................................   2
 11. May I change the rate of my payroll deductions?............................................   3
 12. What happens to my payroll deductions?.....................................................   3
 13. When will my purchase right be exercised?..................................................   3
 14. How will my purchase right be exercised?...................................................   3
 15. What is the purchase price of the Common Stock?............................................   3
 16. How is the fair market value of the Common Stock determined?...............................   3
 17. Will I receive a report indicating the amount and status of my account?....................   3
 18. Are there any limitations on the number of shares I may purchase?..........................   4
 19. What if there are not enough shares available to cover all the exercised purchase rights
     on a particular purchase date?.............................................................   4
 20. May I terminate my purchase right?.........................................................   4
 21. How do I rejoin the Purchase Plan if I terminate my purchase right?........................   4
 22. What happens if my employment terminates or my eligibility status changes?.................   4
 23. What happens if I die while a participant?.................................................   5
 24. What happens if I go on an approved unpaid leave of absence?...............................   5
 25. What happens if I become permanently disabled while a participant?.........................   5
 26. May I assign or transfer my rights under the Purchase Plan?................................   5
 27. What happens if the Corporation is acquired?...............................................   5
 28. What happens if there is a change in the Corporation's capital structure?..................   5
 29. When will I receive the stock certificate for my purchased shares?.........................   6
 30. After becoming a stockholder, may I vote my shares?........................................   6
 31. When may I sell my purchased shares?.......................................................   6
 32. What restrictions apply if I am a Section 16 Insider?......................................   6
 33. What restrictions apply if I am an affiliate?..............................................   7
 34. Should I be concerned about taxes?.........................................................   7
 35. May the Corporation terminate the Purchase Plan?...........................................   7
 36. May the Purchase Plan be amended?..........................................................   7
 37. What is the maximum duration of the Purchase Plan?.........................................   7
 38. Does the Purchase Plan have any impact on the terms of my employment?......................   8
 39. Is the Purchase Plan subject to ERISA?.....................................................   8
</TABLE>
<PAGE>
 
                         TABLE OF CONTENTS (CONTINUED)
                         -----------------------------
<TABLE> 
<CAPTION> 
                                                                                  PAGE
                                                                                  ----
<S>                                                                               <C> 
QUESTIONS AND ANSWERS ON FEDERAL TAX CONSEQUENCES.................................   8
 
 T1. Will the receipt of purchase rights or the purchase of shares on my behalf
     under the Purchase Plan result in taxable income?............................   8
 T2. What if I subsequently sell or dispose of the purchased shares?..............   8
 T3. How do I calculate my taxable income for Purchase Plan transactions?.........   8
 T4. What are the applicable Federal tax rates?...................................   9
 T5. Are there any special tax rules applicable to Section 16 Insiders?...........   9
 T6. What are the Federal tax consequences to the Corporation?....................  10
 
REGISTRANT INFORMATION AND PURCHASE PLAN ANNUAL INFORMATION.......................  10
</TABLE>
 THIS DOCUMENT CONSTITUTES PART OF THE OFFICIAL PROSPECTUS COVERING SECURITIES
          THAT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933.


              INFORMATION ON THE 1995 EMPLOYEE STOCK PURCHASE PLAN
              ----------------------------------------------------

     Mycogen Corporation, a Delaware corporation (the "Corporation"), has
established a new employee stock purchase program which will allow eligible
individuals to acquire shares of the Corporation's common stock (the "Common
Stock") at periodic intervals through their accumulated payroll deductions.  The
new program is officially titled the Mycogen Corporation 1995 Employee Stock
Purchase Plan and will be referred to in this document as the Purchase Plan.
The Purchase Plan is the successor plan to the Mycogen Corporation Restated 1988
Employee Stock Purchase Plan (the "Predecessor Plan").


                 QUESTIONS AND ANSWERS ABOUT THE PURCHASE PLAN
                 ---------------------------------------------

     The Plan Summary and Prospectus sets forth in question and answer format
the major features of the Purchase Plan and the principal rights and benefits
available to the participating employees.

     1.  WHAT IS THE PURPOSE OF THE PURCHASE PLAN?

         The purpose of the Purchase Plan is to provide eligible employees with
         the opportunity to acquire stock ownership in the Corporation through
         periodic payroll deductions. These deductions will be applied at semi-
         annual intervals to purchase shares of Common Stock at a discount from
         the then current market price.
        
     2.  WHEN WILL THE NEW PURCHASE PLAN BECOME EFFECTIVE?

         The Purchase Plan will be submitted to the Corporation's stockholders
         for approval at the 1995 Annual Meeting and, subject to such approval,
         will become effective on December 1, 1995.

     3.  WHAT HAPPENS TO MY OUTSTANDING PURCHASE RIGHTS UNDER THE PREDECESSOR
         PLAN?

         Your purchase rights under the Predecessor Plan will automatically
         terminate on November 30, 1995. As of that date, the Predecessor Plan
         will come to an end, and no further purchase rights will thereafter be
         granted or exercised and no further payroll deductions will be
         collected under the terminated plan.

     4.  WHO ADMINISTERS THE PURCHASE PLAN?

         The Purchase Plan will be administered by the Compensation Committee of
         the Board. All references in this document to "Plan Administrator" will
         accordingly mean the Compensation Committee in its capacity as
         administrator of the Purchase Plan. The members of the Compensation
         Committee are appointed by the Board and may be removed by the Board at
         any time. The members of the Board are elected annually by the
         Company's stockholders, and each Board member serves until he or she
         resigns or until his or her successor is duly elected and qualified.
<PAGE>
 
     5.  HOW MANY SHARES OF COMMON STOCK MAY BE ISSUED UNDER THE PURCHASE PLAN?

         A total of 250,000 shares of Common Stock have been reserved for
         issuance under the Purchase Plan. This authorized share reserve is
         comprised of (i) the estimated number of shares (184,000 shares) which
         will remain available for issuance under the Predecessor Plan following
         the November 30, 1995 purchase date thereunder plus (ii) an additional
         increase of approximately 66,000 shares. These shares will be made
         available either from the Corporation's authorized but unissued shares
         of Common Stock or from shares of Common Stock reacquired by the
         Corporation, including shares repurchased on the open market.
<PAGE>
 
     6.  HOW WILL THE COMMON STOCK BE MADE AVAILABLE FOR PURCHASE?

         Shares of Common Stock will be offered for purchase through a series of
         successive purchase periods, each with a duration of six (6) months.
         Purchase periods will run from the first business day in June to the
         last business day in November each year and from the first business day
         in December each year to the last business day in May in the following
         year. The initial purchase period will begin on December 1, 1995.

     7.  WHO IS ELIGIBLE TO PARTICIPATE IN THE PURCHASE PLAN?

         Employees of the Corporation or any participating subsidiary will be
         eligible to participate in the Purchase Plan if employed on a basis
         under which they are regularly expected to work more than twenty (20)
         hours per week for more than five (5) months per calendar year. As of
         the initial purchase period beginning on December 1, 1995, the
         following subsidiaries will be participating in the Purchase Plan:
         Mycogen Plant Sciences, Mycogen Crop Protection, Mycogen Canada and
         Mycogen Plant Sciences Puerto Rico. You will be notified from time to
         time as additional subsidiaries extend the Purchase Plan to their
         eligible employees.

         Certain individuals eligible to participate in the Purchase Plan will
         be subject to special provisions designed to assure their compliance
         with the short-swing profit restrictions of Section 16(b) of the
         Securities Exchange Act of 1934, as amended (the "1934 Act"). These
         individuals, who will be referred to in this document as "Section 16
         Insiders," include all executive officers of the Corporation. The
         special provisions applicable to Section 16 Insiders will be discussed
         from time to time in this document.0


     8.  WHEN MAY I BECOME A PARTICIPANT?

         You may participate in any purchase period if you satisfy the following
         requirements on the start date of that purchase period:
 
         .  you are an eligible employee of the Corporation or any participating
            subsidiary, and
         .  you have been employed for at least one month.

         On the start date of each purchase period in which you participate in
         the Plan, you will be granted a purchase right to acquire shares of
         Common Stock at the end of that purchase period.

         IF YOU DO NOT JOIN THE PURCHASE PERIOD ON THE START DATE, YOU MAY NOT
         SUBSEQUENTLY JOIN THAT PARTICULAR PURCHASE PERIOD AT ANY LATER DATE.
         ACCORDINGLY, YOU WILL NOT BE ABLE TO PARTICIPATE IN THE PURCHASE PLAN
         UNTIL THE START OF THE NEXT PURCHASE PERIOD.

     9.  HOW DO I BECOME A PARTICIPANT?

         In order to participate in a particular purchase period, you must
         complete and file the appropriate enrollment form with the Plan
         Administrator before the start date of the purchase period. The
         enrollment form includes a stock purchase agreement along with a
         payroll deduction authorization. This form may be obtained from the
         Human Resources Department.

     10. HOW MUCH MAY I INVEST THROUGH THE PURCHASE PLAN?

         You may authorize payroll deductions in 1% multiples of your eligible
         earnings each purchase period, up to a maximum of fifteen percent
         (15%). Your eligible earnings will be limited to your regular base pay
         before any pre-tax or after-tax contributions now or hereafter
         maintained by the Corporation or any participating subsidiary.
<PAGE>
 
     11. MAY I CHANGE THE RATE OF MY PAYROLL DEDUCTIONS?

         You may NOT change your rate of payroll deduction in effect for a
         particular purchase period once that purchase period begins. However,
         you may increase or decrease your rate of payroll deduction for any
         subsequent purchase period by filing a new payroll deduction
         authorization with the Plan Administrator prior to the start date of
         that purchase period. The new rate (which may not be in excess of
         fifteen percent (15%) of your eligible earnings) will become effective
         on the start date of the first purchase period following the filing of
         your new authorization.

     12. WHAT HAPPENS TO MY PAYROLL DEDUCTIONS?

         Your payroll deductions will be credited to an account established in
         your name on the Corporation's books. No interest will be paid on the
         balance credited to your account. However, since the Corporation pays
         all administrative expenses of the Purchase Plan, the full amount of
         your payroll deductions will be applied to the purchase of Common
         Stock. Your payroll deductions may be commingled with the general
         assets of the Corporation and may be used for general corporate
         purposes.

     13. WHEN WILL MY PURCHASE RIGHT BE EXERCISED?

         Your purchase right will be exercised on the last business day of each
         purchase period.

     14. HOW WILL MY PURCHASE RIGHT BE EXERCISED?

         Your purchase right will be exercised by applying the payroll
         deductions credited to your account to the purchase of whole shares of
         Common Stock on each purchase date. Any remaining amount in your
         account will be carried over to the next purchase period. However any
         payroll deductions not applied to the purchase of Common Stock by
         reason of the limitations on the number of shares purchasable per
         participant (see Question 18) will be promptly refunded.

     15. WHAT IS THE PURCHASE PRICE OF THE COMMON STOCK?

         The purchase price per share of Common Stock will be eighty-five
         percent (85%) of the lower of (i) the fair market value per share of
                              -----
         Common Stock on the last business day immediately preceding the start
         date of the purchase period or (ii) the fair market value per share on
         the purchase date. In any event, your purchases of Common Stock will
         always be at a discount of at least fifteen percent (15%) of fair
         market value on the purchase date.

     16. HOW IS THE FAIR MARKET VALUE OF THE COMMON STOCK DETERMINED?

         The fair market value per share on any relevant date under the Purchase
         Plan will be the closing selling price of the Common Stock on that
         date, as reported on the NASDAQ National Market. If there is no
         reported selling price for such date, then the closing selling price on
         the last preceding date for which there is such a quotation will be
         used. Stock prices are reported daily in most major newspapers.

     17. WILL I RECEIVE A REPORT INDICATING THE AMOUNT AND STATUS OF MY
         ACCOUNT?

         After each purchase date, you will receive a report indicating the
         number of shares purchased on your behalf and the purchase price paid
         per share.
<PAGE>
 
     18. ARE THERE ANY LIMITATIONS ON THE NUMBER OF SHARES I MAY PURCHASE?

         Yes.  The following limitations apply:

          (a.) The total number of shares of Common Stock available for purchase
               over the ten (10)-year term of the Purchase Plan is limited to
               250,000 shares (subject to the adjustments described under
               Question 28).

          (b.) The maximum number of shares of Common Stock that you may
               purchase on any one purchase date may not exceed 375 shares
               (subject to the adjustments described under Question 28).

          (c.) You may not purchase shares at a rate in excess of $25,000 worth
               of Common Stock (determined on the basis of the fair market value
               of the Common Stock on the start date of the purchase period) for
               each calendar year your purchase right is outstanding.

          (d.) Finally, no purchase right will be granted to any employee who,
               immediately after the grant of such right, would own (or
               otherwise hold options or other rights to purchase) stock
               possessing five percent (5%) or more of the total voting power or
               value of all classes of stock of the Corporation or any parent or
               subsidiary corporation.

         Any payroll deductions collected from you which cannot be applied to
         the purchase of Common Stock by reason of one or more of these
         limitations will be refunded.

     19. WHAT IF THERE ARE NOT ENOUGH SHARES AVAILABLE TO COVER ALL THE
         EXERCISED PURCHASE RIGHTS ON A PARTICULAR PURCHASE DATE?

         If the total number of shares for which purchase rights are to be
         exercised on any purchase date exceeds the number of shares at the time
         available for issuance under the Purchase Plan, then the Plan
         Administrator will make a pro-rata allocation of the available shares
         on a uniform and non-discriminatory basis, and any payroll deductions
         not applied to the purchase of the available shares will be refunded.

     20. MAY I TERMINATE MY PURCHASE RIGHT?

         Yes. You may terminate your purchase right by filing the prescribed
         notification form with the Plan Administrator at any time before the
         last day of any purchase period. No further payroll deductions will be
         collected on your behalf during the remainder of that period. Any
         payroll deductions already collected for that purchase period will be
         applied to the purchase of Common Stock at the end of the period. Once
         you have terminated your purchase right for a particular purchase
         period, you may not rejoin that purchase period at any later date, and
         you must wait until the start of a new purchase period to resume
         participation.

     21. HOW DO I REJOIN THE PURCHASE PLAN IF I TERMINATE MY PURCHASE RIGHT?

         Individuals who terminate their purchase rights may participate in any
         subsequent purchase period by filing a new enrollment form on or before
         the start date of that purchase period. Section 16 Insiders, however,
         will be subject to certain restrictions on their ability to rejoin a
         new purchase period following their withdrawal from an earlier purchase
         period. See Question 32 below.

     22. WHAT HAPPENS IF MY EMPLOYMENT TERMINATES OR MY ELIGIBILITY STATUS
         CHANGES?

         Your participation in the Purchase Plan will immediately cease should
         your employment terminate for any reason (other than death or
         disability) or should you otherwise lose your status as an eligible
         employee. Any payroll deductions collected on your behalf for the
         purchase period in which your termination or loss of eligibility occurs
         will automatically be refunded to you.
<PAGE>
 
     23. WHAT HAPPENS IF I DIE WHILE A PARTICIPANT?

         The person to whom your rights under the Purchase Plan are transferred
         by will or the laws of inheritance may elect to (i) withdraw any
         payroll deductions collected on your behalf for the purchase period in
         which your death occurs or (ii) have those funds held for the purchase
         of Common Stock on the next scheduled purchase date. The election may
         be made at any time prior to that purchase date, and in the absence of
         such election, your payroll deductions will automatically be refunded.
         In no event may any further payroll deductions be made on your behalf
         after your death.

     24. WHAT HAPPENS IF I GO ON AN APPROVED UNPAID LEAVE OF ABSENCE?

         Your payroll deductions will cease with the paycheck immediately
         preceding the start of your leave and will not resume unless you return
         to active service before the end of the purchase period in which your
         leave began. Your existing payroll deductions for that purchase period
         may either be withdrawn or applied to the purchase of Common Stock on
         the next scheduled purchase date. Your must, however, make your
         election at the time your leave begins; otherwise, your payroll
         deductions will automatically be refunded.

     25. WHAT HAPPENS IF I BECOME PERMANENTLY DISABLED WHILE A PARTICIPANT?

         If your employment terminates due to permanent disability, you may
         elect to (i) withdraw all the payroll deductions collected on your
         behalf for the purchase period in which such termination occurs or (ii)
         have those funds held for purchase of Common Stock on the next
         scheduled purchase date. The election may be made at any time prior to
         that purchase date. In the absence of such election, your payroll
         deductions will automatically be refunded. In no event, however, will
         any further payroll deductions be collected on your behalf following
         your termination of employment.

         You will be deemed to be permanently disabled should you become unable
         to engage in any substantial gainful employment by reason of any
         medically determinable physical or mental impairment expected to result
         in death or to be of continuous duration of at least twelve (12)
         months.

     26. MAY I ASSIGN OR TRANSFER MY RIGHTS UNDER THE PURCHASE PLAN?

         No. Your purchase rights cannot be assigned or transferred, except by
         will or the laws of inheritance following your death.

     27. WHAT HAPPENS IF THE CORPORATION IS ACQUIRED?

         If the Corporation is acquired, whether by merger or asset sale or sale
         of more than fifty percent (50%) of the Corporation's outstanding
         voting stock (an "Acquisition"), then all payroll deductions for the
         purchase period in which such Acquisition occurs will automatically be
         applied to the purchase of Common Stock immediately prior to the
         effective date of the Acquisition, subject to the share limitations
         summarized in Question 18. The purchase price of such shares will be
         eighty-five percent (85%) of the lower of (i) the fair market value of
                                          -----
         the Common Stock on the last business day immediately preceding the
         purchase period in which such Acquisition occurs or (ii) the fair
         market value of the Common Stock immediately prior to the effective
         date of the Acquisition.

     28. WHAT HAPPENS IF THERE IS A CHANGE IN THE CORPORATION'S CAPITAL
         STRUCTURE?

         In the event of any stock dividend, stock split, recapitalization,
         combination of shares, exchange of shares or other change affecting the
         outstanding Common Stock as a class without the Corporation's receipt
         of consideration, appropriate adjustments will be made to (i) the
         maximum number and class of securities issuable under the Purchase
         Plan, (ii) the maximum number and class of securities purchasable per
         participant on each purchase date and (iii) the number and class of
         securities and the price per share in effect under each outstanding
         purchase right. Such adjustments will prevent any dilution or
         enlargement of the rights and benefits of Purchase Plan participants.
<PAGE>
 
     29. WHEN WILL I RECEIVE THE STOCK CERTIFICATE FOR MY PURCHASED SHARES?

         You may at any time request the issuance of a stock certificate for any
         shares purchased on your behalf under the Purchase Plan. However, not
         more than one certificate will be issued to your for each purchase
         period of participation. Your may specify whether the certificate
         should be issued in your name alone or in the name of you and your
         spouse as community property or as joint tenants with right of
         survivorship. Alternatively, you may request the certificate to be
         issued directly to a Corporation-designated brokerage account so that
         you can sell the shares promptly at any time.

     30. AFTER BECOMING A STOCKHOLDER, MAY I VOTE MY SHARES?

         Yes, even if you do not have physical possession of a stock
         certificate.

     31. WHEN MAY I SELL MY PURCHASED SHARES?

         Individuals who purchase Common Stock under the Purchase plan may
         resell such shares without restriction, except for Section 16 Insiders
         and other persons who are considered to be affiliates of the
         Corporation.

     32. WHAT RESTRICTIONS APPLY IF I AM A SECTION 16 INSIDER?

         Section 16(b) of the 1934 Act requires the Corporation to recover any
         profit realized by any Section 16 Insider from any purchase and sale,
         or sale and purchase, of shares of Common stock made within a period of
         less than six (6) months. As a result, the following rules will be in
         effect for Section 16 Insiders who participate in the Purchase Plan:

          (i.)   The acquisition of Common Stock under the Purchase Plan will
                 NOT be treated as a purchase of those shares for short-swing
                 liability purposes, provided the acquired shares are held for
                 at least six (6) months after the purchase date. The exempt
                 purchase must be reported on the Form 5 filed by the Section 16
                 Insider for the fiscal year in which the shares are acquired or
                 may be reported on any earlier Form 4 filed after the purchase
                 date.

          (ii.)  In the event the Section 16 Insider makes a special irrevocable
                 election to participate in the Purchase Plan at a specified
                 rate of payroll deduction, with no right to withdraw the funds
                 so contributed to the Purchase Plan, then any acquisition of
                 Common Stock made under the Purchase Plan more than six (6)
                 months after the effective date of that election will NOT be
                 treated as a purchase of those shares for short-swing liability
                 purposes, and the acquisition will NOT be matched against any
                 sale of Common Stock made within six (6) months before or after
                 the acquisition date.

          (iii.) Should a Section 16 Insider who has not made such an
                 irrevocable election sell any Purchase plan shares within six
                 (6) months after the purchase date, then the acquisition of
                 those shares will be treated as a purchase for short-swing
                 liability purposes, retroactive to such purchase date, and must
                 be reported on a Form 4 filed by the Section 16 Insider within
                 ten (10) days after the close of the calendar month in which
                 the sale is made. The non-exempt acquisition will be matched
                 with any sales of Common stock made by the Section 16 Insider
                 within six (6) months before or after the retroactive purchase
                 date, including the sale which triggered the non-exempt
                 treatment.

                 NOTE:  The exemption for the acquisition of common stock under
                        the Purchase Plan will not be lost if other shares of
                        Common Stock held by the Section 16 Insider are sold
                        within six (6) months after the purchase date.

          (iv.)  If the Section 16 Insider who has not filed the special
                 irrevocable election withdraws from a purchase period, then
                 that individual may be precluded from rejoining the Purchase
                 plan until the start date of a new purchase period beginning at
                 least six (6) months after the earlier withdrawal date in order
                 to preserve the exempt status of any Purchase Plan acquisitions
                 he or she may have made within the preceding six (6) months.
<PAGE>
 
          (v.)   Any change made by the Section 16 Insider to the special
                 irrevocable election filed under the Purchase Plan (including a
                 decision to withdraw from the offering period) will not become
                 effective for at least six (6) months.

     33.  WHAT RESTRICTIONS APPLY IF I AM AN AFFILIATE?

          In general, persons with power to manage and direct the policies of
          the Corporation, relatives of these people and trusts, estates,
          corporations or other entities controlled by any of these people may
          be deemed to be affiliates of the Corporation. Affiliates of the
          Corporation are obligated to resell their shares of Common Stock in
          compliance with Rule 144 of the Securities and Exchange Commission
          ("SEC"). This rule requires sales to be effected in "broker's
          transactions," as defined in such rule, and a written notice of each
          sale must be filed with the SEC at the time of the sale. The rule also
          limits the number of shares which may be sold in any three (3)-month
          period to no more than the greater of (i) one percent (1%) of the
                                     -------
          outstanding shares of Common Stock or (ii) the average weekly reported
          volume of trading in such shares on all securities exchanges during
          the four (4) calendar weeks preceding the filing of the required
          notice of proposed sale. However, the two (2)-year holding period
          requirement of Rule 144 will not be applicable to any Common Stock
          acquired under the Purchase Plan.

          OFFICERS OF THE CORPORATION SHOULD CONSULT WITH COUNSEL BEFORE
          OFFERING FOR SALE ANY SHARES OF COMMON STOCK ACQUIRED UNDER THE
          PURCHASE PLAN IN ORDER TO ASSURE THEIR COMPLIANCE WITH RULE 144,
          SECTION 16 AND ALL OTHER APPLICABLE PROVISIONS OF FEDERAL AND STATE
          SECURITIES LAWS.

     34.  SHOULD I BE CONCERNED ABOUT TAXES?

          Yes. A summary description of the Federal tax consequences applicable
          to your participation in the Purchase Plan is included below.

     35.  MAY THE CORPORATION TERMINATE THE PURCHASE PLAN?

          Yes. The Plan Administrator has the discretion to terminate all
          outstanding purchase rights immediately following the close of any
          purchase period. If the Plan Administrator exercises this discretion,
          the Purchase Plan will terminate in its entirety, no further purchase
          rights will thereafter be granted or exercised and no further payroll
          deductions will be collected under the terminated plan.

     36.  MAY THE PURCHASE PLAN BE AMENDED?

          The Board may alter or amend the Purchase Plan at any time to become
          effective immediately following the close of any purchase period.
          However, no amendment may be made without approval of the
          Corporation's stockholders if the amendment would (i) materially
          increase the number of shares of Common Stock which may be issued over
          the term of the Purchase Plan or the number of shares which may be
          purchased per participant on each purchase date, except for certain
          permissible adjustments in the event of changes to the Corporation's
          capital structure, (ii) reduce the purchase price formula specified in
          the Purchase Plan or (iii) otherwise materially increase the benefits
          available under the Purchase Plan or materially modify the eligibility
          requirements for participation.

     37.  WHAT IS THE MAXIMUM DURATION OF THE PURCHASE PLAN?

          The Purchase Plan will in all events terminate upon the earliest of
                                                                  --------
          (i) the last business day in November 2005, (ii) the date on which all
          shares available for issuance under the Purchase Plan have been sold
          or (iii) the date on which all purchase rights are exercised in
          connection with an Acquisition.
<PAGE>
 
     38.  DOES THE PURCHASE PLAN HAVE ANY IMPACT ON THE TERMS OF MY EMPLOYMENT?

          Neither the Purchase Plan nor any outstanding purchase right is
          intended to provide any participant with the right to remain in the
          Corporation's employ for any specific period, and both you and the
          Corporation will each have the right to terminate your employment at
          any time and for any reason, with or without cause.

     39.  IS THE PURCHASE PLAN SUBJECT TO ERISA?

          The Purchase Plan is not subject to the provisions of the Employee
          Retirement Income Security Act of 1974 ("ERISA") or Section 401(a) of
          the Internal Revenue Code.


               QUESTIONS AND ANSWERS ON FEDERAL TAX CONSEQUENCES
               -------------------------------------------------

     The following is a description of the Federal income tax consequences of
participation in the Purchase Plan.  State and local tax treatment, which is not
discussed below, may vary from such Federal income tax treatment.  You should
consult with your own tax advisor as to the tax consequences of your particular
transactions under the Purchase Plan.

     T1.  WILL THE RECEIPT OF PURCHASE RIGHTS OR THE PURCHASE OF SHARES ON MY
          BEHALF UNDER THE PURCHASE PLAN RESULT IN TAXABLE INCOME?

          No taxable income will be reportable upon your receipt of a purchase
          right under the Purchase Plan.  However, the Purchase Plan is not a
                                                                        ---
          qualified employee stock purchase plan under Section 423 of the
          Internal Revenue Code, and you will accordingly recognize compensation
          income at the time your purchase right is exercised. The amount of
          such income will be equal to the fair market value of the shares of
          Common Stock purchased on your behalf at the time of such purchase
          less the purchase price paid for those shares. The Corporation will
          include this income on your W-2 statement for the calendar year in
          which you acquire the shares, and you must satisfy all Federal, state
          and local withholding and other payroll taxes applicable to such
          income at the time your purchase right is exercised.

     T2.  WHAT IF I SUBSEQUENTLY SELL OR DISPOSE OF THE PURCHASED SHARES?

          Any gain or loss recognized upon your subsequent sale or disposition
          of the purchased shares will be either capital gain or capital loss.
          Whether the capital gain or loss is long-term or short-term will
          depend on the period of time the shares are held prior to sale. Gain
          or loss on shares held for more than one (1) year will be long-term.

     T3.  HOW DO I CALCULATE MY TAXABLE INCOME FOR PURCHASE PLAN TRANSACTIONS?

          The following example will illustrate the taxable income you will have
          to report upon your acquisition of Purchase Plan shares and the
          additional taxable income you will recognize upon your subsequent sale
          of those shares.

          EXAMPLE: On December 1, 1995 you enroll in the Purchase Plan when the
          -------
          fair market value per share is $12.00 and contribute $1,000.00 for the
          purchase period ending May 31, 1996. On May 31, 1996, the fair market
          value per share is $15.00, and the purchase price for your shares will
          accordingly be $10.20 per share (85% of $12.00). 98 shares of Common
          Stock will be purchased on your behalf on May 31, 1996 at the $10.20
          price per share (1,000/$10.20). Your taxable income at the time of
          such purchase will be determined as follows:

             Ordinary Income Per Share
             -------------------------
             $15.00 fair market value at May 31, 1996 purchase less
             $10.20 per share purchase price = $4.80 per share at the time of
               purchase
<PAGE>
 
          Assume you subsequently sell the shares for $20.00 per share. Your
          taxable income at that time will be determined as follows:

             Capital Gain Per Share
             ----------------------
             $20.00 per share selling price less
             $15.00 fair market value on May 31, 1996 = $5.00 per share

          The capital gain will be long-term if you hold the shares for at least
          one (1) year after the May 31, 1996 purchase date.

     T4.  WHAT ARE THE APPLICABLE FEDERAL TAX RATES?

          Ordinary income is subject to a maximum Federal tax rate of 39.6% on
          taxable income in excess of $256,500 ($128,250 for a married taxpayer
          filing a separate return). The applicable $256,500 or $128,250
          threshold is subject to cost-of-living adjustments in taxable years
          beginning after December 31, 1995. Certain limitations are imposed
          upon a taxpayer's itemized deductions, and the personal exemptions
          claimed by the taxpayer are subject to phase-out. These limitations
          may result in the taxation of ordinary income at an effective top
          marginal rate in excess of 39.6%. Long-term capital gains are taxed at
          the same rates as ordinary income, subject to a maximum rate of 28%.

          For the tax year ending December 31, 1995, itemized deductions are
          reduced by 3% of the amount by which the taxpayer's adjusted gross
          income for the year exceeds $114,700 ($57,350 for a married taxpayer
          filing a separate return). The reduction may not, however, exceed 80%
          of the total itemized deductions (excluding medical expenses, casualty
          and theft losses, and certain investment interest expenses) claimed by
          the taxpayer. The applicable $114,700 or $57,350 threshold is subject
          to cost-of-living adjustments in taxable years beginning after
          December 31, 1995.

          In addition, the deduction for personal exemptions claimed by the
          taxpayer is reduced by 2% for each $2,500 ($1,250 for a married
          taxpayer filing a separate return) or fraction thereof by which the
          taxpayer's adjusted gross income for the year exceeds a specified
          threshold amount. The applicable thresholds for 1995 are $172,050 for
          married taxpayers filing joint returns, $114,700 for single taxpayers
          and $86,025 for married taxpayers filing separate returns.
          Accordingly, the deduction is completely eliminated for any taxpayer
          whose adjusted gross income for the year exceeds the applicable
          threshold amount by more than $122,500. The threshold amounts will be
          subject to cost-of-living adjustments in taxable years beginning after
          December 31, 1995.

     T5.  ARE THERE ANY SPECIAL TAX RULES APPLICABLE TO SECTION 16 INSIDERS?

          If you are a Section 16 Insider, the applicable tax rules for the
          acquisition and sale or other disposition of Purchase Plan shares
          acquired by you will be as follows:

          . Purchase Plan shares acquired by you will, under the Federal tax
            laws, be deemed to be subject to a substantial risk of forfeiture
            for the six (6)-month period following the purchase date, since the
            sale of those shares at a profit during that six (6)-month period
            will trigger short-swing liability under Section 16(b) of the 1934
            Act. Accordingly, there will be no taxable income recognized at the
            time the Purchase Plan shares are acquired, unless you make a
            Section 83(b) election to be taxed at that time (see next
            paragraph). Without such a Section 83(b) election, taxation will be
            deferred for six (6) months, and you will, at the end of such
            deferral period, recognize ordinary income in an amount equal to the
            excess of (i) the fair market value of the purchased shares at that
            time over (ii) the purchase price paid for those shares.

          . If your Purchase Plan shares are deemed to be subject to a 
            substantial risk of forfeiture, then you may elect under Code
            Section 83(b) to include as ordinary income in the year those shares
            are purchased an amount equal to the excess of (i) the fair market
            value of those shares at the time of purchase over (ii) the purchase
            price paid for the shares. If your make the Section 83(b) election,
            you will not recognize any additional income when the forfeiture
            period subsequently lapses.
<PAGE>
 
          . If you choose to file a special irrevocable election to participate
            in the Purchase Plan at a specified rate of payroll deduction, with
            no right to withdraw the funds so contributed, then any acquisition
            of Purchase Plan shares made more than six (6) months after the
            effective date of such election will be an exempt transaction under
            the Federal securities laws, and the acquired shares will NOT be
            deemed to be subject to a substantial risk of forfeiture for
            purposes of the Federal tax laws. Accordingly, you will recognize
            taxable income, immediately upon your acquisition of those shares,
            in an amount equal to their fair market value at the time of
            purchase less the purchase price paid for those shares.

          . Whether or not you file the special irrevocable election, your sale
            of the Purchase Plan shares will result in capital gain to the
            extent the amount realized upon the sale exceeds the fair market
            value of the shares at the time you recognized the ordinary income
            with respect to their acquisition. A capital loss will result to the
            extent the amount realized upon the sale is less than such fair
            market value. The gain or loss will be long-term if the shares are
            held for more than one (1) year prior to the sale. For shares issued
            to Section 16 Insiders, the capital gain holding period will
            generally start six (6) months after the purchase date, unless the
            Section 16 Insider files a Section 83(b) election to be taxed on the
            shares at the time of purchase or the shares are otherwise purchased
            pursuant to the special irrevocable election.

     T6.  WHAT ARE THE FEDERAL TAX CONSEQUENCES TO THE CORPORATION?

          The Corporation will be entitled to a business expense deduction equal
          to the amount of ordinary income recognized by the participant in
          connection with his or her acquisition of the Purchase Plan shares.
          The deduction will normally be allowed for the taxable year in which
          such acquisition occurs.


          REGISTRANT INFORMATION AND PURCHASE PLAN ANNUAL INFORMATION
          -----------------------------------------------------------

     Mycogen Corporation is a Delaware corporation which maintains its principal
executive offices at 5501 Oberlin Drive, San Diego, California 92121.  The
telephone number at the executive offices is (619) 453-8030.  You may contact
the Corporation at this address or telephone number for further information
concerning the Purchase Plan and its administration.

     A copy of the Corporation's Annual Report to Stockholders for the most
recent fiscal year will be furnished to each participant in the Purchase Plan,
and additional copies will be furnished, without charge, to each participant
upon written or oral request to the Corporate Secretary of the Corporation at
its principal executive offices, or upon telephoning the Corporation at its
principal executive offices.  In addition, any person receiving a copy of this
Prospectus may obtain without charge, upon written or oral request to the
Corporate Secretary, a copy of any of the documents listed below, which are
hereby incorporated by reference into this Prospectus, other than certain
exhibits to such documents:

     (a.) The Corporation's Annual Report on Form 10-K for the fiscal year ended
          December 31, 1994 filed with the SEC on March 3, 1995;

     (b.) The Corporation's Quarterly Reports on Form 10-Q for the fiscal
          quarters ended March 31, 1995 and June 30, 1995, filed with the SEC on
          May 15, 1995 and August 10, 1995, respectively;

     (c.) The Corporation's Registration Statement No. 0-15881 on Form 8-A filed
          with the SEC on May 7, 1992 in which there is described the terms,
          rights and provisions applicable to the Corporation's Common Stock;
          and

     (d.) Any similar report filed subsequently with the SEC and distributed to
          the Corporation's stockholders.

     The Corporation will also deliver to each participant in the Purchase Plan
who does not otherwise receive such materials a copy of all reports, proxy
statements and other communications distributed to the Corporation's
stockholders

<PAGE>
 
                                                                      EXHIBIT 24
                                        
                           Consent of Ernst & Young,
                              Independent Auditors
<PAGE>
 
                 CONSENT OF ERNST & YOUNG, INDEPENDENT AUDITORS

      We consent to the incorporation by reference in the Registration Statement
(Form S-8) pertaining to the Mycogen Corporation 1995 Employee Stock Purchase
Plan and of our report dated October 17, 1995, with respect to the consolidated
financial statements and schedules of Mycogen Corporation included and
incorporated by reference in its Annual Report (Form 10-K) for the year ended
August 31, 1995, filed with the Securities and Exchange Commission.



                                    /s/ Ernst & Young



                                    ERNST & YOUNG



San Diego, California
February 9, 1996

<PAGE>
 
                                                                      EXHIBIT 25

                               Power of Attorney
<PAGE>
 
                               POWER OF ATTORNEY

     KNOW ALL PERSONS BY THESE PRESENTS:

     WHEREAS, Mycogen Corporation (the "Corporation") intends to file a
Registration Statement of Form S-8, regarding the registration of shares
reserved for issuance under the Corporation's 1995 Employee Stock Purchase Plan,
with the Securities and Exchange Commission under the provisions of the
Securities Act of 1933, as amended.

     WHEREAS, the undersigned are directors of the Corporation.

     NOW, THEREFORE, the undersigned hereby constitute and appoint Jerry
Caulder, Carlton J. Eibl, James A. Baumker, or any of them, as their attorneys-
in-fact to act in their place and stead and to execute and to file such
Registration Statement and any amendments or supplements thereto, giving and
granting to said attorneys full power and authority to do and perform each and
every act whatsoever requisite and necessary to be done in and about the
premises, with full power of substitution, as fully to all intents and purposes
as the undersigned might or could do if personally present at the doing thereof,
and hereby ratifying and confirming all that said attorneys may or shall
lawfully do or cause to be done by virtue hereof.

     IN WITNESS WHEREOF, the undersigned have executed this Power of Attorney
this 9th day of February, 1996.


 /s/ Thomas J. Cable
- --------------------
(Thomas J. Cable)

 /s/ George R. Hill
- -------------------
(George R. Hill)

 /s/ Kenneth H. Hopping
- -----------------------
(Kenneth H. Hopping)

/s/ David H. Rammler
- --------------------
(David H. Rammler)

 /s/ A. John Speziale
- ---------------------
(A. John Speziale)


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