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Validation and Refinement of a Hazard Rating Model for Fir Engraver-Caused Mortality in Grand Fir Stands

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A previously developed hazard rating model designed to estimate grand fir mortality caused by the fir engraver, Scolytus ventralis, was tested in 8 grand fir stands. The observed and predicted mortality levels were similar for both number and proportion of trees killed during a 3-year period. Refinements in the model and its parameters based on a larger data set are also presented. Forest Sci. 24:309-312.

Keywords: Abies grandis; Crown Competition Factor; Diversity Index; Scolytus ventralis; modified Gauss-Newton method; nonlinear regression

Document Type: Journal Article

Affiliations: College of Forestry, Wildlife and Range Sciences, University of Idaho, Moscow

Publication date: June 1, 1978

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