Entomology Commons^™

Baseline Susceptibility Of European Corn Borer (Lepidoptera: Crambidae) To Bacillus Thuringiensis Toxins, Paula C. R. G. Macron, Linda J. Young, Kevin L. Steffey, Blair Siegfried

Department of Entomology: Faculty Publications

Susceptibility to CrylAb and CrylAc toxins from Bacillus thuringiensis was determined for 11 populations of neonate European corn borer, Ostrinia nubilalis (Hiibner), from the United States and 1 from northern Italy. Corn borer larvae were exposed to artificial diet treated with increasing B. thuringiensis concentrations, and mortality and growth inhibition were evaluated after 7 d. The range of variation in B. thuringiensis susceptibility indicated by growth inhibition was very similar to that indicated by mortality. Although interpopulation variation in susceptibility to both proteins was observed, the magnitude of the differences was small (54-fold) and comparable to the variability observed among …