Blue Mountains forest health report: new perspectives in forest health
U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Region, Malheur, Umatilla, and the Wallowa-Whitman National Forests, 1991 - Nature
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acres bark beetles basal area beetle attack beetle outbreaks beetle populations beetle-caused Blue Mountains conifer damage defoliation diversity Douglas-fir beetle Douglas-fir tussock moth dwarf mistletoe ecosystem effects Engelmann spruce factors Ferrell fir engraver fire Forest and Range Forest Health forest insects Forest Plans Forest Service fungus grand fir growth habitat harvest host trees impacts increase infested trees insect and disease killed larvae levels lodgepole pine long-term losses lssue Malheur National Forest management allocation mountain pine beetle occur Oregon Pacific Northwest percent pheromone pine stands ponderosa pine productivity Range Experiment Station Ranger Districts regeneration resource management result riparian root disease salvage seral silvicultural soil species spruce beetle stand conditions suppression Tech timber treatment true fir tussock moth outbreak U.S. Department Umatilla National Forest USDA vegetation Wallowa-Whitman National Forest Washington watershed western larch western pine beetle western spruce budworm white fir Wickman wildlife