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Spruce Beetles Attack Slowly Growing Spruce

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White spruce (Picea glauca (Moench) Voss) stands were examined in 1982 to determine the relationship of tree growth to spruce beetle attack in an active spruce beetle (Dendroctonus rufipennis (Kirby)) infestation on the Kenai Peninsula of Alaska. Conservative statistical comparisons showed that mean recent radial growth of unattacked trees on 25 plots sampled in 1982 was higher than radial growth of unsuccessfully attacked or beetle-killed trees. Mean radial growth of trees killed by beetles in 1982 did not differ significantly from radial growth of trees killed before 1982, but radial growth of trees unsuccessfully attacked in 1982 was significantly higher than radial growth of trees killed by beetles before 1982. In addition, trees killed in 1982 had significantly higher density of completed egg galleries than trees unsuccessfully attacked in 1982, but did not differ in diameter. Larger average tree diameters and faster radial growth rates of spruce occurred in stands with lower stocking levels. Results suggest that stand resistance to spruce beetle could be enhanced by decreasing stocking to reduce tree competition and increase vigor of residuals. Forest Sci. 31:839-850.

Keywords: Dendroctonus rufipennis; Picea glauca; host vigor

Document Type: Journal Article

Affiliations: Research Entomologist, USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, OR 97208

Publication date: 1985-12-01

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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