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Pattern and Rate of Decline of a Population of Carolina Hemlock (Tsuga caroliniana Engelm.) in North Carolina
Southeastern Naturalist
  • Foster Levy, East Tennessee State University
  • Elaine S. Walker, East Tennessee State University
Document Type
Article
Publication Date
7-1-2014
Description

We monitored a population of Carolina Hemlocks in northwestern North Carolina for four years to examine the rate and pattern of decline in response to infestation by Adelges tsugae (Hemlock Woolly Adelgid). Our yearly census of hemlock condition and severity of the adelgid infestation included trees of all sizes. We estimated declines in condition as the portions of the leaf canopy that were lost. Initially, infestation occurred throughout the population but was severe in only a small cluster of individuals. Within 1 year, the area of severe infestation increased in size to encompass 48% of the population. In another region of the population, there was a cluster of relatively healthy individuals comprised largely of seedlings. Of the 4 size-classes of trees, sapling-sized individuals experienced the highest rates of decline in condition. Most trees declined to poor health within 3 years of an observation of moderate to severe infestation.

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Copyright Statement

Copyright of Southeastern Naturalist is the property of Eagle Hill Institute. This document was published with permission from the journal. It was originally published in the Southeastern Naturalist.

Citation Information
Foster Levy and Elaine S. Walker. "Pattern and Rate of Decline of a Population of Carolina Hemlock (Tsuga caroliniana Engelm.) in North Carolina" Southeastern Naturalist Vol. 13 Iss. sp6 (2014) p. 46 - 60 ISSN: 1528-7092
Available at: http://works.bepress.com/foster-levy/4/