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Title: Western Spruce Budworm
Author: Fellin, David G.; Dewey, Jerald E.;
Source: Forest Insect & Disease Leaflet 53. [Missoula, MT:] U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station
Publication Series: Forest Insect and Disease Leaflet (FIDL)
Description: The western spruce budworm, Choristoneura occidentalis Freeman, is the most widely distributed and destructive defoliator of coniferous forests in Western North America. It is one of nearly a dozen Choristoneura species, subspecies, or forms, with a complexity of variation among populations found throughout much of the United States and Canada. It occurs in the Rocky Mountains from Arizona and New Mexico northward into Colorado, Utah, Wyoming, Montana, and Idaho; in the Pacific Northwest in Oregon and Washington; and in British Columbia and Alberta, Canada.
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Fellin, David G.; Dewey, Jerald E. 1982. Western Spruce Budworm. Forest Insect & Disease Leaflet 53. [Missoula, MT:] U.S. Dept. of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station
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