Mortality of white spruce during a spruce beetle outbreak on the Kenai Peninsula in Alaska

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Abstract
White spruce (P. glauca (Moench) Voss) stands in the Resurrection Creek watershed in south-central Alaska were infested by spruce bettles, D. rufipennis Kirby, in 1974-1975. Thirty permanent plots were established within the infested area in 1976 to evaluate the immediate and long-term impact on white spruce beetles. This loss accounted for 59% of the commerical white spruce volume in the watershed. Mortality was greatest in the larger diameter classes during the early part of the infestation, but smaller diameter trees were subsequently attacked as the number of noninfested trees declined. The impact of spruce beetles on structure and species composition of white spruce stands is given along with a discussion of management implications.

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