Survival of Different Bollworm and Tobacco Budworm Larval Instars Exposed to a Commercially Formulated Bt Product in Diet Incorporated Bioassays

Field collected bollworm and tobacco budworm larvae from wild and cultivated hosts were separated by instar and placed in cups with meridic diet containing various concentrations of a commercially formulated Bt product, Dipel DF^®. Survival of different larval instars from feral colonies was compared to laboratory susceptible insects.  Assay results for each species and instar will be presented.