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A Method of Hazard-Rating White Spruce Plantations For Yellowheaded Spruce Sawfly Defoliation

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A hazard-rating model for defoliation by the yellowheaded spruce sawfly was developed and validated using 25 white spruce plantations in north central Minnesota. The dependent variable was degree of defoliation, and the independent variables, as measured from small-format aerial photographs, were steepness and slope aspect. The site characteristics and defoliation were correlated using a maximum likelihood logistic regression. The final model determined that steep, south-facing slopes had the highest probability of sawfly-caused defoliation. Identification of high-hazard sites should be a major component of a management plan for this pest. North. J. Appl. For. 3:104-105, Sept. 1986.

Document Type: Journal Article

Affiliations: Department of Entomology, University of Minnesota, St. Paul 55108

Publication date: 1986-09-01

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  • Each regional journal of applied forestry focuses on research, practice, and techniques targeted to foresters and allied professionals in specific regions of the United States and Canada. The Northern Journal of Applied Forestry covers northeastern, midwestern, and boreal forests in the United States and Canada.
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