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Survey of Worm Damaged Cotton Bolls in Northeast Louisiana

T.B. McKnight, R.D. Bagwell, and S.T. Kelly

ABSTRACT

Bt-transgenic cotton varieties, that are active against several caterpillar pests, have been grown in Louisiana since 1996. In 2002, approximately 492,000 acres of cotton were grown in Louisiana with an expected average yield of 698 pounds per acre. Approximately 77 percent of the cotton acreage was planted to a Bt-transgenic variety. Approximately eighty percent of the cotton producers that grew these Bt-transgenic varieties used the 95:5 embedded refuge option (Bt:non-Bt), while the remaining producers opted for either the 80:20 (predominate), the 95:5 untreated option, or did not plant any Bt cotton.

Boll sample surveys were taken to compare the amount of damage caused by worms in Bt and non-Bt varieties on various farms in northeast Louisiana. Comparisons were made among Bt cotton and associated refuge planted under the 95:5 embedded, or the 80:20 option or 100 percent non-Bt cotton.





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Document last modified April 16, 2003