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    Author(s): Jacqueline L. Robertson; Nancy L. Gillette; Melvin Look; Barbara A. Lucas; Robert L. Lyon
    Date: 1975
    Source: Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6p.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (916.0 KB)

    Description

    The contact toxicity of 100 insecticides to last stage larvae of Choristoneura occidentalis Freeman was tested by topical application in a 10-yr series of screening experiments. Pyrethroids were generally the most toxic group of chemicals tested. Compounds more toxic than the standard, mexacarbate, at Ld50 were: bioethanomethrin, (+) cis-resmethrin, (+) trans-resmethrin, (+) cis-phenothrin. ENT 29117 (5-benzly-3-furylmethyl (IR,3S,E) 2,2-dimethyl-3- (2-oxo-3-tetrahydrothiophenylidenmethly) cyclopropanecarboxylate), resethrin, and NRDC 143 (3-phenoxybenzly(±) -3-(2,2-dichlorovinyl-2,2-dimethylcyclopropanecarboxylate). Mexacarbate spray was tested on the western spruce budworm at selected developmental stages. First instars were least susceptible at both LD50 and ld90; instars 3-5 and 6th instars weighing less than 110 mg were most susceptible. Since long-term laboratory rearing of insects did not change their responses to 3 representative chemicals periodically tested during this series of experiments, the results represented a valid estimate of relative toxicity.

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    Citation

    Robertson, Jacqueline L., Gillette, Nancy L., Look, Melvin, Lucas, Barbara A., Lyon, Robert L. 1975. Toxicity of selected insecticides applied to western spruce budworm. Berkeley, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station. 6p.

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