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): Katharine A. Sheehan
    Date: 1996
    Source: Gen. Tech. Rep. PNW-GTR-367. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 55 p
    Publication Series: General Technical Report (GTR)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (2.53 MB)

    Description

    Effects of insecticide treatments conducted in Oregon and Washington from 1982 through 1992 on subsequent defoliation by western spruce budworm (Choristoneura occidentalis Freeman) were evaluated by using aerial sketchmaps and a geographic information system. For each treatment, the extent and severity of defoliation was calculated for the treated area and a set of four nested rings surrounding the treated area (0-0.5 mile, 0.5-1 mile, 1-2 miles, and 24 miles) for up to 8 years: 3 years prior to treatment, the year of treatment, and 4 years following treatment. lnsecticide treatments applied in 1982 and 1983 coincided with reduced percentages of defoliation by western spruce budworm during the year following treatment. However, the percentage of defoliation usually returned to pretreatment levels by the second year, and defoliation severity in treated and adjacent untreated areas was nearly identical following treatment. For the period from 1985 through 1992, defoliation patterns (including both extent and severity) following treatment were generally similar in treated and adjacent untreated areas.

    Publication Notes

    • You may send email to pnw_pnwpubs@fs.fed.us 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.

    Citation

    Sheehan, Katharine A. 1996. Effects of insecticide treatments on subsequent defoliation by western spruce budworm in Oregon and Washington: 1982-92. Gen. Tech. Rep. PNW-GTR-367. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 55 p

    Cited

    Google Scholar

    Keywords

    Western spruce budworm, Choristoneura occidentalis, defoliation, insecticides, effects, suppression projects

    Related Search


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