Regression Sampling Plan for Twospotted Spider Mite (Acari: Tetranychidae) in Oregon Peppermint

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A sampling plan for detecting aggregations of Tetranychus urticae Koch was developed to aid pest management decisions in peppermint, Mentha piperita L. Ten to 14 sites were sampled for every 74 ha. At each site, 45 leaves (15 top, 15 middle, 15 bottom) were evaluated for the presence of five or more T. urticae. The sample mean was estimated from the equation: log (x_bar + 1) = 0.18 + 0.59 log (INF5 + 1), which was based on the relationship between the mean density of mites (x_bar) and the number of leaves per sample with five or more mites present (INF5). The coefficient of determination for this relationship is 0.92. The equation provides an accurate estimate of mean mite densities over widely separated regions, during different growing seasons, and for fields with different mite densities.

Document Type: Research Article

Publication date: June 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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