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): Donald D. Davis; Matthew S. Fromm; Matthew D. Davis
    Date: 2007
    Source: e-Gen. Tech. Rep. SRS–101. U.S. Department of Agriculture, Forest Service, Southern Research Station: 157-162 [CD-ROM].
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (234 KB)

    Description

    We evaluated the past 60-70 years of radial growth of old-growth eastern hemlock [Tsuga canadensis (L.) Carr] infested with the hemlock woolly adelgid (Adelges tsugae Annand) in south-central Pennsylvania. Although undocumented, the initial adelgid infestation may have occurred within the stand in the early 1990s. Increment cores were extracted during May 2003 from lightly infested and severely infested canopy hemlocks. Those hemlocks that were growing more slowly in the decades prior to adelgid infestation ultimately exhibited more severe infestation. This indicates that that slower-growing hemlocks may be inherently more susceptible to the adelgid, or that stressed trees growing on poor sites may be more susceptible. Radial growth of severely infested canopy hemlocks was below normal by the mid-1990s; growth of lightly infested trees began to decline several years later. Severely infested trees exhibited a short-term, spike in growth immediately prior to a precipitous growth decline that eventually lead to mortality.

    Publication Notes

    • You may send email to pubrequest@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

    Davis, Donald D.; Fromm, Matthew S.; Davis, Matthew D. 2007. Impact of the hemlock woolly adelgid on radial growth of Eastern hemlock in Pennsylvania. e-Gen. Tech. Rep. SRS–101. U.S. Department of Agriculture, Forest Service, Southern Research Station: 157-162 [CD-ROM].

    Related Search


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