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Research Paper

Title: Western spruce budworm as related to stand characteristics in the bitterroot national forest

Author: Williams, Carroll B., Jr.; Shea, Patrick J.; Walton, Gerald S.

Date: 1971

Source: Res. Paper PSW-RP-072. Albany, CA: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station; 13 p.

Station ID: RP-PSW-072

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.

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

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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: U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station; 13 p.

Last Modified: Nov 18, 2013 12:45:42 PM