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Abnormal Ray Tissue in Three True Firs Infested by the Balsam Woolly Aphid

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Stem-infesting populations of the balsam woolly aphid (Adelges piceae) cause North American true firs to produce abnormally dense, reddish wood resembling compression wood. A characteristic of this wood is an abnormal proliferation of ray tissue. Investigation of three species of western true firs, Abies grandis, A. amabilis, and A. lasiocarpa, showed that wood from aphid-infested trees had 35 to 73 percent more rays per square millimeter of tangential surface than normal wood, depending on the particular species. Rays were also some 15 to 35 percent taller and wider than normal. Volume of ray tissue in aphid-infested trees was 150 to 180 percent greater than normal. Reaction to aphid infestations seemed to be essentially the same in all three tree species.

Document Type: Journal Article

Affiliations: Entomologist, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S Dept. Agric., Portland, Oreg.

Publication date: September 1, 1967

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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