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The analysis of the attack distribution of an endemic Douglas-fir beetle population

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  • Felled second-growth Douglas-fir trees in western Washington were used to determine the attack distribution and develop a sampling technique for an endemic Douglas-fir beetle, Dendroctonue peeudotaugae Hopk. (Coleoptera: Scolytidae) population. The attack density varied by circumferential position. The lowest density was on the upper bole and the highest on one side with intermediate densities on the other side and the bottom. The sampling technique provides estimates of the number of trees and the number of samples within each tree needed to estimate the mean density of attack with a standard error of ten percent of the mean. The optimal quadrat size for the within-tree samples was shown to be between 182.9 and 365.8 square centimeters.
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