Douglas-Fir Sapwood Starch In Relation to Log Attack By The Ambrosia Beetle, Trypodendron

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Abstract:

Starch in the sapwood of living Pseudotsuga menziesii (Mirb.) Franco varies considerably in amount during the year, with maximum and minimum quantities in early spring, and late summer, respectively. In cut logs, it slowly decreases in quantity over a period of many weeks. Logs with relatively much starch are not attacked by Trypodendron lineatum (Oliv.). Logs selected by the beetles have little or no starch, but many unattacked logs also contain little or no starch; there does not, therefore, appear to be a direct relationship between starch and log attractiveness.

Document Type: Journal Article

Affiliations: Research Officer, Technician, and Control Officer, Forest Entomology and Pathology Laboratory, Victoria, B.C.

Publication date: December 1, 1963

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