Abstract
Ten chemicals representative of four insecticide groups (carbamate, organophosphate, chlorinated hydrocarbon, and pyrethroid) were applied topically to mixed groups of 5th- and 6th-stage larvae of Malacosoma californicum californicum (Packard). Only 2—the pyrethroid NIA 24110 ((5-benzyl-3-furyl) methyl trans- (+)-3-(cyclopentylidene-methyl)-2,2-dimethylcyclopropanecarboxylate), and resmethrin—were more toxic than DDT at LD50. Because of the low slope of DDT, however, 8 insecticides exceeded it in toxicity at LD90. These were, in decreasing order of toxicity, NIA 24110, resmethrin, methomyl, pyrethrins, mexicarbate, carbaryl, and malathion.
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