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Sample Size and Temporal Variation Effects on Mortality of Colorado Potato Beetle (Coleoptera: Chrysomelidae) in a Filter-Paper Bioassay

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Filter-paper bioassays were performed on Colorado potato beetles, Leptinotarsa Decemlineata (Say),collected from three commercial potato fields to determine the most cost-effective number of sample units (filter-paper disks, 10 larvae per disk). Relative net precision values from three different insecticide bioassays were used as an indication of sample-size efficiency and were based on variation in larval mortality and sample cost. Greatest sample-size efficiency in all insecticide bioassays was achieved from a sample of two to five filter-paper disk sample units (20-50 total larvae). Additional insecticide bioassays were done with Colorado potato beetle larvae collected at different times during the season (from a commercial potato field and from experiment-station plots) to determine whether the larval generation sampled or previous insecticide application affected results of the bioassay. Although trends in mortality were not always consistent among first generation larvae sampled on different dates (from insecticide-treated and untreated plots), first-generation larvae exhibited significantly greater mortality in the bioassay compared with second-generation larvae. Based on these results, it is recommended that bioassays to estimate the effectiveness of a particular insecticide against Colorado potato beetle be performed on the target generation immediately before the planned insecticide treatment.

Document Type: Research Article

Publication date: April 1, 1993

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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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