Sampling for Larvae of Operophtera occidentalis (Lepidoptera: Geometridae) on Cherry

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Larvae of a winter moth, Operophtera occidentalis (Hulst), occurred on sweet cherry in western Oregon from late March to early June. A cluster of buds-leaves was determined to be the most discrete and suitable sample unit for estimating larval density. Variance-mean ratios indicated that the dispersion of larvae within trees was random but larval dispersion between trees was clumped. Apical bud-leaf clusters contained nearly twice as many larvae as subapical clusters. The number of bud-leaf clusters and trees to be sampled was determined as a dependent variable based on a proportion of the mean larval density.

Document Type: Research Article

Publication date: December 1, 1982

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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.
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