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Update on Pink Bollworm Resistance to Bt Cotton in the Southwest

Timothy J. Dennehy, Gopalan C. Unnithan, Sarah A. Brink, Brook D. Wood, Yves Carrière, Bruce E. Tabashnik, Larry Antilla, and Mike Whitlow


Monitoring of Arizona pink bollworm (PBW), Pectinophora gossypiella, susceptibility to Bt toxin Cry1Ac has been conducted annually since 1997. PBW were collected from cotton fields located throughout the Southwest in 2002, cultured in the laboratory, and tested for susceptibility to Cry1Ac using diet-incorporation bioassays. A total of 13 collections from Arizona were successfully reared and bioassayed. Six California collections and one collection each from New Mexico and Texas were also tested.

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Document last modified 04/27/04