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Western spruce budworm as related to stand characteristics in the bitterroot national forestAuthor(s): Carroll B. Williams; Patrick J. Shea; Gerald S. Walton
Source: Res. Paper PSW-RP-072. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 13 p
Publication Series: Research Paper (RP)
Station: Pacific Southwest Research Station
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DescriptionRelation of population density to certain stand conditions and damage indicators was analyzed in four drainages on the Bitterroot National Forest of Montana. Western spruce budworm (Choristoneura occidentalis Freeman) populations were strongly related to plot basal area, tree species, and tree crown levels, and also to current and past levels of tree defoliation. Relatively open stands of thrifty trees are recommended, with logging of true fir and Douglas-fir to favor nonhost trees, to reduce vulnerability to excessive budworm damage.
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CitationWilliams, Carroll B., Jr.; Shea, Patrick J.; Walton, Gerald S. 1971. Western spruce budworm as related to stand characteristics in the bitterroot national forest. Res. Paper PSW-RP-072. Albany, CA: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture; 13 p
KeywordsChoristoneura occidentalis, population dynamics, site factors, basal area, Pseudotsuga menziesii, Picea engelmannii, Abies spp., mortality, Bitterroot N. F.
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