Abnormal Ray Tissue in Three True Firs Infested by the Balsam Woolly Aphid
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.
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Document Type: Journal Article
Affiliations: Entomologist, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S Dept. Agric., Portland, Oreg.
Publication date: 1967-09-01
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