Abstract
Variation in polysubstrate monooxygenase activity, as measured by the epoxidation of aldrin, was studied in colonies of the honey bee, Apis mellifera L. Significant differences were found among colonies in spring, summer, and fall. In addition, colonies varied in their detoxification capacity from season to season, being least able to metabolize aldrin in the spring. Significant regression of the LD50 of diazinon on aldrin epoxidase activity indicated the involvement of these enzymes in determining intercolony diazinon resistance. The results also suggest that studying a number of populations with quantitatively different monooxygenase activities can give information on the in vivo metabolism of phosphorothioate insecticides.
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