Abstract
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.
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