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Using Pheromone-Baited Traps To Control the Amount and Distribution of Tree Mortality During Outbreaks of the Douglas-Fir Beetle

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Abstract:

Multiple-funnel traps baited with strong aggregation pheromone lures were placed throughout three 259 ha plots in northeastern Oregon during an outbreak of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins. Mean numbers (± SEM) of Douglas-fir beetles collected per plot for the entire flight periods of 1992 and 1993 were 277,921 ± 40,447 and 268,834 ± 37,088, respectively. Mean numbers (± SEM) of the most abundant predator, Thanasimus undatulus (Say), collected per plot in 1992 and 1993 were 43,527 ± 3,553 and 35,652 ± 3,514, respectively. Douglas-fir beetle-caused tree mortality was concentrated around the trap sites in the treated plots, even though traps were located an average of 40 m from the nearest host tree. Managers can influence the spatial distribution of tree mortality during an outbreak by selective placement of traps across the landscape. Selective trap placement, plus the removal of trapped beetles from the population, may reduce tree mortality within the general area. For. Sci. 43(1):65-70.

Keywords: Dendroctonus pseudotsugae; Thanasimus undatulus; aggregation pheromones; bark beetles; mass trapping

Document Type: Journal Article

Affiliations: Research Entomologist, USDA Forest Service, Pacific Northwest Research Station, 3200 Jefferson Way, Corvallis, OR 97331

Publication date: February 1, 1997

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