Spruce Beetles in Blowdown
Attack and beetle densities varied significantly among trees and among the top, lateral, and bottom surfaces of the bole, but insignificantly throughout the infested portion of any one surface. These characteristics are discussed in relation to outbreak potential and biological evaluation procedures.
Schmid, J. (1981). Spruce beetles in blowdown. USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, Research Note RM-411, 5 pp.