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    Author(s): Jacqueline L. Robertson; Nancy L. Gillette
    Date: 1973
    Source: Journal of Economic Entomology. 66(3):629-630
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (195.27 KB)


    Ten chemicals representative of four insecticide groups (earbamate, organophosphate, chlorinated hydrocarbon, and pyrethroid) were applied topically to mixed groups of 5th- and 6th-stage larvae of Malaeosoma californicum califomicum (Packard). Only 2&emdash;the pyrethroid NIA 24110 ((5-benzyl-3-furyl) methyl trans-( +)-3-(cyclopentylidenemethyl)-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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    Robertson, Jacqueline L.; Gillette, Nancy L. 1973. Western tent caterpillar: Contact toxicity of ten insecticides applied to the larvae. Journal of Economic Entomology. 66(3):629-630.

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