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Mortality of Douglas-fir After Operational Semiochemical Baiting for Douglas-fir Beetle (Coleoptera: Scolytidae)

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Effects of an operational application of synthetic Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins) attractants applied to Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) trees have not been well documented. Baits, containing a 1:1 mixture of frontalin and alpha-pinene, were deployed over 64 acres in an area application at the rate of 2 baits/ac. Baited trees, and unbaited Douglas-firs surrounding the bait centers, were selected for measurements. All baited trees were attacked along with 42.3% of the surrounding unbaited Douglas-firs. Attacked trees were significantly larger than unattacked trees and were closer to the bait centers. The percentage of trees attacked was not influenced by cardinal direction from the bait center. Approximately 97% of the baited trees were either moderately or heavily attacked. Almost 60% of the moderately and heavily attacked unbaited Douglas-firs were within 33 ft of the bait centers. A model to predict probability of infestation of unbaited trees surrounding the bait center was developed. West. J. Appl. For. 12(1):16-20.

Document Type: Journal Article

Affiliations: USDA Forest Service, Cascade Ranger District, Boise National Forest, Cascade, ID 83611

Publication date: 1997-01-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Western Journal of Applied Forestry covers the western United States, including Alaska, and western Canada; WJAF will also consider manuscripts reporting research in northern Mexico that has potential application in the southwestern United States.
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