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Bt Cotton - the Second Year - a Consultant's Perspective

Roger Carter


Bt cotton varieties yielded less than comparable standards in the east-central region of Louisiana in 1997. NuCotn 33B & 35B yielded less than its respective non-Bt parents; exhibited less vegetative growth than in 1996; exhibited more plant bug & boll weevil problems than standard varieties treated with pyrethroids; required a second picking; had lower total insecticide costs than standards; and similar value to standard varieties when considering inputs versus value. Paymaster BG1330RR exhibited the "wilt" and yielded substantially less than other Bt varieties. Oversprays of Bt cotton plots with synthetic pyrethroids or Orthene on both an as needed and scheduled basis increased yields dramatically.

Reprinted from Proceedings of the 1998 Beltwide Cotton Conferences pp. 960 - 961
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998