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Stand Conditions and Spruce Budworm Damage in a Western Montana Forest

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This paper reports the relationship of site quality, crown closure, and percent Douglas-fir (Pseudotsuga menziesii Mirb. [Franco]) to defoliation caused by spruce budworm (Choristoneura fumiferana [Clem.]) on a western Montana forest. Significantly less defoliation was observed on moist bottomland sites than on drier hillsides. Open stands, and stands with low percentage of Douglas-fir also incurred considerably less defoliation than did dense stands and stands composed mostly of Douglas-fir. Silvicultural control of budworm defoliation seems unfeasible on the area studied. Defoliation on good quality sites is not severe enough to warrant such control measures; on poor sites, only undesirably low-stocking levels, or low percentages of Douglas-fir would create a condition having low defoliation risk.
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Document Type: Journal Article

Affiliations: Associate Professor of Forest Management, University of Montana, Missoula

Publication date: 1969-05-01

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  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    2016 Impact Factor: 1.675 (Rank 20/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

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