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Sweep-Net Sampling for Western Spotted Cucumber Beetle (Coleoptera: Chrysomelidae) in Snap Beans: Spatial Distribution, Economic Injury Level, and Sequential Sampling Plans

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Sweep-net and absolute density samples for adult western spotted cucumber beetle (WSCB), Diabrotica undecimpunctata undecimpunctata Mannerheim (Coleoptera: Chrysomelidae), in snap beans, Phaseolus vulgaris L., were analyzed using Iwao's patchiness regression and Taylor's power law. Iwao's patchiness regression described sweep-net and absolute density samples better than Taylor's power law. The equation that described the patchiness regression of sweep sampling data was m_* = 0.10 + 1.07m. Linear regression analysis of the relationship between WSCB relative density and snap bean pod damage provided the basis for estimating the economic injury level for WSCB in snap beans at a daily average of 4.1 beetles per 10 sweeps (corrected) during the 14 d preceding harvest. An average of 3.0 beetles per 10 sweeps (corrected) was proposed as the economic threshold. Thresholds adjusted to compensate for circadian variation in sweep sampling efficiency ranged from 1.2 to 3.3 beetles per 10 sweeps (uncorrected). Adjusted thresholds were used with α and  values from the sweep-net patchiness regression to construct critical-density sequential sampling plans modified for specific sampling times. Sequential sampling plans for fixed-precision population density estimates also were constructed.

Document Type: Research Article

Publication date: December 1, 1987

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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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