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Douglas-Fir Defects caused by the Douglas-Fir Beetle

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The Douglas-fir beetle is shown to cause pitch streaks in Douglas-fir. These insects are attracted to dead or dying trees but also attack nearby healthy, standing trees. Usually only a small percentage of the attacked trees are killed. The rest sustain some kind of beetle-caused defect in the form of pitch pockets or streaks. Most Douglas-fir incur attacks before being removed from the stand. Silvicultural practices based on an understanding of this relationship can result in a reduction in wood defects.

Document Type: Journal Article

Affiliations: Assistant Professor of Forest Entomology, College of Forestry, University of Washington, Seattle

Publication date: April 1, 1965

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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