Determination of Growth Reduction in Douglas-fir Infected by Phellinus weirii
Abstract:Growth of Douglas-fir infected by Phellinus (Poria) weirii was evaluated. Each of the 171 trees in a 40-year-old stand was mapped, felled, and examined. Annual volume growth was calculated from measurements of 10 or more cross sections per stem. Two approaches were used to compare actual with expected growth of diseased trees: (1) A regression equation, developed from healthy tree data, was used to estimate expected growth of diseased trees; and (2) healthy and diseased trees were paired on the basis of similar growth before disease, and continuing growth of the healthy tree was taken as the expected value. Both approaches gave similar results. Based on expected volume increase during the final 10 years of growth and volume at harvest, infected trees averaged losses of 13 and 7 percent, respectively; trees killed by the disease averaged losses of 32 and 12 percent, respectively. Growth of individual trees varied widely in response to disease. Number or size of infected roots or crown symptoms were not related to growth of individual trees. Forest Sci. 29:305-315.
Document Type: Journal Article
Affiliations: Research Plant Pathologist, Forestry Sciences Laboratory, USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Corvallis, Oregon 97331
Publication date: 1983-06-01
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