EXHIBIT 23 CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS 136 CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statement (Forms S-8 and S-3) and in the related Prospectuses of our report dated October 11, 1996, with respect to the consolidated financial statements of Mycogen Corporation, included in the Annual Report (Form 10-K) for the year ended August 31, 1996. /s/ Ernst & Young ERNST & YOUNG LLP San Diego, California November 11, 1996 137