Abstract
Plutella xylostella (L., 1758) (Lepidoptera: Plutellidae) is a major insect pest of cruciferous crops worldwide. The most common biopesticides used to control P. xylostella are based on the entomopathogenic bacterium Bacillus thuringiensis Berliner (Bt) (Bacillaceae). P. xylostella was the first insect in which field resistance to Bt was identified. Although many different insects are sus…