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Pheromone-Baited Traps forDendroctonus pseudotsugae(Coleoptera: Scolytidae): Influence of Selected Release Rates and Trap Designs

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Several different aggregation pheromone release rates and trap designs were evaluated for trapping the Douglas-fir beetle, Dendroctonus pselldotsugae Hopkins. Frontalin:seudenol release rates of 160:80,80:40,40:20, 20:10, 10:5,and 1:0.5 mg/ d, respectively, with a constant ethanol release rate of 88 mg/d at 24°C were tested in multiple-funnel traps. The highest Douglas-fir beetle catches occurred at release rates of 20:10 and 10:5 mg/ d. There were significantly fewer catches at higher and lower release rates. The percentage of male Douglas-fir beetles increased significantly with increasing release rates up to a plateau at 80:40 mg/d. Catches of Thanasimus undatuius (Say) (Coleoptera: Cleridae), a predator, increased consistently with higher release rates. Multiple-funnel traps caught significantly more Douglas-fir beetles than slotted-panel traps for both total numbers and number per unit area of trapping surface. There was no difference between the 2 trap types in selectivity for Douglas-fir beetles relative to T. undatulus. Placing metal screens with 6- or 12-mm openings above the collection cup to filter intercepted insects or providing a strip of metal screen with 1.5-mm openings to serve as an escape route for predators from the collection cup in multiplefunnel traps resulted in capture of a significantly higher ratio of Douglas-fir beetles to predators. These results will contribute to the development of more efficient trapping programs to lessen the impact of Douglas-fir beetle outbreaks.

Document Type: Research Article

Publication date: April 1, 1998

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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.
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