Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Jacqueline E. Robertson; Nancy L. Gillette; Barbara A. Lucas; Robert L. Lyon
    Date: 1976
    Source: Journal of Economic Entomology.69(1):99-104
    Publication Series: Scientific Journal (JRNL)
    PDF: Download Publication  (484.99 KB)


    The contact toxlaty 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 LD90 were: bioethanomethrin, (+) cis-resmethrin, (+) trans-resmethrin, (+) cis-phenothrill. ENT 29l17 (5-benzyl-3-furylmethyl (IR,3S,E) 2,2-dimethyl-3- (2-oxo-3-tetrahydrothiophenylidenmethyl) cyclopropanecarboxylate), resmethrin, and NRDC 143 (3-phenoxybenzyl (±) -3- (2,2-dichlorovinyl-2,2-dimethylcyclopropanecarboxylate). Mexacarbate spray was tested on the western spruce budworm at selected developmental stages. First instal's 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.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Robertson, Jacqueline E.; Gillette, Nancy L.; Lucas, Barbara A.; Lyon, Robert L. 1976. Toxicity of selected insecticides applied to western spruce budworm. Journal of Economic Entomology.69(1):99-104.

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page