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Assessing Dwarf Mistletoe on Western Hemlock

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Stem analyses of 30 dominant and codominant Tsuga heterophylla trees, averaging 110 years old, indicated that, despite the earlier establishment and greater initial height of trees severely infected with hemlock dwarf mistletoe (Arceuthobium campylopodum f.tsugensis), their growth was significantly retarded compared to that of lightly and moderately infected trees. Between 1955 and 1962, lightly infected trees had 41 percent greater volume growth and 84 percent greater height growth than severely infected trees. Volume loss became evident in 1945 and was nearly 60 cubic feet per acre per year by 1960 for dominant and codominant trees. The number, position, and size of mistletoe infections on each tree were determined and various assessment procedures compared. For assessing growth losses, a rating system based on only the middle third of the tree is recommended.

Keywords: Arceuthobium campylopodum f.tsugensis; Tsuga heterophylla; disease impact on trees

Document Type: Journal Article

Affiliations: Research Scientist, Canada Dept. of Fisheries and Forestry, Forest Research Laboratory, Victoria, British Columbia

Publication date: September 1, 1969

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  • 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.
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