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): Christopher J. Fettig; Joel D. McMillin; John A. Anhold; Shakeeb M. HamudRobert R. BorysSteven J. Seybold
    Date: 2007
    Source: In: Powers, Robert F., tech. editor. Restoring fire-adapted ecosystems: proceedings of the 2005 national silviculture workshop. Gen. Tech. Rep. PSW-GTR-203, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: p. 306
    Publication Series: General Technical Report (GTR)
    Station: Pacific Southwest Research Station
    PDF: View PDF  (115.0 KB)

    Description

    Selective logging, fire suppression, forest succession, and climatic changes have resulted in high fire hazards over large areas of the western USA. Federal and state hazardous fuel reduction programs have increased accordingly to reduce the risk, extent and severity of these events, particularly in the wildland urban interface. In this study, we examined the effect of mechanical fuel reduction treatments on the activity of bark beetles in ponderosa pine, Pinus ponderosa Dougl ex. Laws., stands located in Arizona and California, USA. Treatments were applied in both late spring (April-May) and late summer (August-September) and included: (1) thinned biomass chipped and randomly dispersed within each plot, (2) thinned biomass chipped, randomly dispersed within each plot, and raked 2 m from the base of residual trees, (3) thinned biomass lop-and-scattered (thinned trees cut into 1-2 m lengths) within each plot, and (4) an untreated control. The mean percentage of trees attacked by bark beetles ranged from 2.0 percent (untreated control) to 30.2 percent (plots thinned in spring with all biomass chipped). A three-fold increase in the proportion of trees attacked by bark beetles was observed in chipped versus lop-and-scattered plots. Higher levels of bark beetle colonization were associated with spring treatments. Raking chips away from the base of residual trees did not significantly affect attack rates. Several bark beetle species were present including the roundheaded pine beetle, Dendroctonus adjunctus Blandford, western pine beetle, D. brevicomis LeConte, mountain pine beetle, D. ponderosae Hopkins, red turpentine beetle, D. valens LeConte, Arizona fivespined ips, Ips lecontei Swaine, California fivespined ips, I. paraconfusus Lanier, and pine engraver, I. pini (Say). Dendroctonus valens was the most common bark beetle infesting residual trees.
    Based on these results, managers should consider chipping during periods of bark beetle inactivity (e.g., late summer through winter) when possible. Reasonable effort should be made to limit large quantities of chips from directly contacting residual trees. Treatments that promote the desiccation of slash and slow release of monoterpenes prior to chipping should be considered. The implications of these results to sustainable forest management were discussed in detail.

    Publication Notes

    • You may send email to psw_communications@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

    Fettig, Christopher J.; McMillin, Joel D.; Anhold, John A.; Hamud, Shakeeb M.; Borys, Robert R.; Seybold, Steven J. 2007. The effect of mechanical fuel reduction treatments in the wildland-urban interface on the amount and distribution of bark beetle-caused tree mortality. In: Powers, Robert F., tech. editor. Restoring fire-adapted ecosystems: proceedings of the 2005 national silviculture workshop. Gen. Tech. Rep. PSW-GTR-203, Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture: p. 306

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/25921