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Instar II larvae of Choristoneura occidentalis Freeman, hibernate on the bole and on the foliage, twigs, and stems of branches at all levels in pole-size Douglas-firs. About 65% arc on the branches and 35% on the bole. The lower 3rd of the crown is a suitable universe for sampling over- wintering larvae; about 27% hibernate on the branches at this level, and the estimate has a relatively low variation. Branch samples can be drawn from this stratum without felling the trees.
Document Type: Research Article
Publication date: February 1, 1969
More about this publication?
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.