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Effects of the Balsam Woolly Aphid upon Wood Anatomy of Some Western True Firs

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Balsam woolly aphid (Chermes piceae) infestations on the main stem of North American Abies cause the trees to produce annual rings with abnormally large amounts of dark, reddish wood. Anatomical investigations of the xylem tissue of Abies grandis, A. lasiocarpa, and A. amabilis revealed that in abnormal wood the cells were circular rather than rectangular in cross section; secondary cell walls were abundantly marked with checks; the proportion of thick-walled, summerwood-like tissue was greatly increased; and there was an unusual proliferation of traumatic resin canals. Other distinguishing characteristics of the abnormal wood were: Cell walls in the springwood were about 50 percent thicker than normal; tracheids were some 40 percent shorter; fibril angle was two to three times greater; and the number of rays per unit area was nearly doubled. These effects of woolly aphid attack occurred in all three tree species and in about equal proportions.

Document Type: Journal Article

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

Publication date: 1965-06-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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