Detoxification enzyme differences between a herbivorous and predatory mite.

ABSTRACT

The detoxification capabilities of the predatory mite Amblyseius fallacis and its herbivorous prey Tetranychus urticae are fundamentally different. The activities of mixed-function oxidase and trans-epoxide hydrolase are higher in the prey than in the predator; those of cis-epoxide hydrolase and glutathione transferase are lower; and esterase activity is similar. Dissimilarities may be related both to differing adaptations to plant allelochemicals and to the higher respiration rate of the predator. Hydrolytic and conjugating reactions appear more important than oxidative pathways in imparting organophosphate resistance to these acarines. These resistances provide insecticide selectivity favorable to the predator and improved integrated pest control.