A quadratic regression model (Y = 4.015 + 0.4419X − 0.001036X2) for forecasting defoliation potential by larch casebearer on western larch was developed. The model utilizes systematic counts of overwintering larvae of Coleophora laricella (Hübner) on 40 branch samples/sample point (X) to forecast intensity of feeding injury which is expressed as a numerical rating (Y) and can be translated into 4 broad classes of damage: negligible, light, moderate, and heavy. The model permits prediction of potential feeding injury to within 1 defoliation class, 98 out of 100 times.
Document Type: Research Article
Publication date: February 1, 1974
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.