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Testing the Susceptibility of Field-Collected Bollworm and Tobacco Budworm Populations to a Homogeneous CryIAc-Incorporated Diet

Greg Payne, John Adamczyk, and Carlos Blanco


Bollworm and tobacco budworm populations were evaluated for resistance to CryIAc endotoxins using an incorporated diet bioassay. Mortalities were assessed following a seven day exposure period. CryIAc endotoxins were less effective against bollworm larvae as compared to tobacco budworm larvae. Bollworm LC50 values ranged from 42 ppm to 145 ppm. An LC50 value of 1.0 ppm was recorded for the tobacco budworm population. These values were approximately 2-3 times greater than LC50 values obtained from comparable populations collected between 1996 through 1999. It is imperative that Bt resistance monitoring remain a priority for future studies.

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Document last modified 04/27/04