ABSTRACT
The activity of formulations of Bacillus thuringiensis commercially available or in the product development stage were measured by assay of tobacco budworm (Heliothis virescens), corn earworm (Helicoverpa zea), and soybean looper (Pseudoplusia includens) using diet incorporation techniques. Cotton terminals were sprayed in a spray chamber and exposed to tobacco budworm to obtain additional comparative information. The nuclear polyhedrosis virus of Heliothis and a pyrethroid insecticide, cypermethrin, were included as treatments in some experiments. Preliminary results of this continuing research effort are reviewed, and implications of the results relative to the development of pest control recommendations are considered.
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