Pitch Defects in Red Pine Associated with Unsuccessful Attacks by Ips spp.
Abstract:Vertical scars and catfaces on red pine in Virginia and West Virginia were shown to be associated with unsuccessful attacks by Ips spp. (mostly I. grandicollis Eichh.). The bark scars were directly over depressions on the surface of the wood which were directly over pitch defects buried in the wood under one to eight annual growth rings. The defects were composed of Ips nuptial chambers and egg galleries; pitch streaks that extended from a few inches to a foot above and below the gallery and horizontally into the heart-wood; and pitch pockets in most defects with galleries that were three inches or longer. The defects occurred at the beginning of the springwood or at the end of the summerwood. Both male and female beetle galleries were present beneath bark scars over two inches long. The phenomena are discussed in relation to the occurrence of red pine south of its natural range.
Document Type: Journal Article
Affiliations: Assistant Professor, Department of Entomology and of Forestry and Wildlife, Virginia Polytechnic Institute, Blacksburg, Va.
Publication date: 1964-05-01
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