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The possibility of attracting Dendroctonus pseudotsugae Hopkins, by baiting host trees with frontalin (1,5- dimethyl 6,8-dioxabicyclo[3.2.1]octane), camphene and alpha pinene was tested in southern Idaho during 1970. Mature Douglas-fir, PseudotSllga menziesii (Mirb) Franco, on 8 scattered plots ranging in area from 11 to 34 acres were baited with Douglure (2 parts frontalin: 0.7 parts camphene, and 0.3 parts alpha pinene) contained in polyethylene caps. Trees averaging over 18 inches in diameter were selected at 132-foot intervals on a grid pattern and were alternately treated with attractant or empty caps. Three months after placing the caps, 100% of the J57 baited trees and 8% of the 154 unbaited trees had 6 or more attacks per square foot bark surface at. a height of 12 feet Beetle attacks eventually spread 10 trees adjacent to those baited, killing 58.5% of those which had a DBH of 4 inches or larger and were within 33 feet of a baited tree. A trend was detected in this attack pattern which suggested that as distance from the bait increased from 14 to 33 feet a preference was shown for larger diameter classes. Under 14 feet, all trees 24 inches and greater were attacked and killed. Utilization of chemical messengers, frontalin and host terpenes, in the management of the Douglas-fir beetle by the trap-tree harvest. method is a distinct possibility. The biological effectiveness of these compounds and the simplicity of their deployment should encourage further studies toward adoption of the technique as a routine practice in Douglas-fir management.
Document Type: Research Article
Publication date: June 1, 1972
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.