Abstract
Chlordimeform (CDF) was tested for its ability to act jointly with an organophosphorus insecticide (parathion) and a series of carbamate insecticides. Three arthropod species were used as test subjects: the two-spotted spider mite, Tetranychus urticae; the German cockroach, Blatella germanica; and the flour beetle, Tenebrio castaneum. CDF potentiated the toxicity of several carbamate insecticides to B. germanica and T. castaneum. However, CDF antagonized the toxicity of parathion toward B. germanica while it acted in a greater than additive fashion toward T. castaneum. No combination of CDF and insecticide tested acted jointly toward T. urticae. Species-specific differences in sensitivity, absorption, metabolism, and mode of delivery account for the varying results. Metabolic studies of pairs of compounds using two radiolabeled carbamates showed that CDF altered the metabolic detoxification of both carbaryl and aldicarb. The results suggest that CDF may inhibit MFOs as its mode of action.
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