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Determination of Growth Reduction in Douglas-fir Infected by Phellinus weirii

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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.

Keywords: Pseudotsuga menziesii; disease

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

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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