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    Author(s): Carroll B. Williams; Patrick J. Shea; Gerald S. Walton
    Date: 1971
    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
    PDF: View PDF  (398 KB)

    Description

    Relation 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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    Citation

    Williams, 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

    Keywords

    Choristoneura occidentalis, population dynamics, site factors, basal area, Pseudotsuga menziesii, Picea engelmannii, Abies spp., mortality, Bitterroot N. F.

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