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Biodeterioration of Oaks Killed Following Defoliation by the Gypsy Moth

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The volume of sound wood in red oaks dead following gypsy moth defoliation (biotically killed trees) and in mechanically girdled control trees decreased significantly as time after death increased. Bark retention, site quality, and method of death were correlated with the volume of wood degraded. Three growing seasons after death, biotically killed trees that retained their bark had greater volumes of degraded wood than those that shed their bark. Trees on oak site class 1 had greater volumes of degraded wood than those on oak site class 2. Wood of girdled trees deteriorated faster than that of biotically killed trees. By the end of the third growing season after death, 19% of the gross merchantable volume and 21% of the board foot volume of biotically killed trees had been degraded. In a separate population of biotically killed trees, 44% of the trees had been wind-thrown seven growing seasons after death. Based on these studies, salvage operations for most timber uses should be completed within 2 years after tree death. South. J. Appl. For. 13(3):139-145.
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Document Type: Journal Article

Affiliations: Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802

Publication date: 1989-08-01

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