Within-Field Variation in Susceptibility of Colorado Potato Beetle (Coleoptera: Chrysomelidae) to Insecticides: Implications for Sampling Methods in an Insecticide Resistance Bioassay
Authors: VENCILL, A. M.; ZEHNDER, G. W.
Source: Journal of Economic Entomology, Volume 86, Number 2, April 1993 , pp. 289-293(5)
Publisher: Entomological Society of America
Abstract:Within-field variation in mortality of Colorado potato beetle, Leptinotarsa Decemlineata (Say), in a filter-paper insecticide bioassay was determined in three Virginia potato fields in 1989 and five fields in 1990. Bioassays were done for each of three different insecticides on Colorado potato beetle larvae collected from 12-16 different locations (equal = size blocks or grids) per field. Comparisons of 95% mortality confidence intervals (CI) between all possible block-pair combinations per field indicated that field size had no influence on variation in Colorado potato beetle mortality in the bioassay. No apparent relationship existed between the level of insecticide susceptibility of the Colorado potato beetle population (LC90) and the percentage of blocks within a field with overlapping mortality CIs. Bioassay data from sample fields indicated that a single bioassay (of Colorado potato beetles from one location per field) will yield at least a 0.50 probability (>0.90 in six of the eight fields) of estimating the mean mortality response (±5%) of Colorado potato beetles in the entire field. The probability of sampling potato beetles from one location that differed in mean mortality from individuals collected in another location within the same field decreased as the number of locations sampled increased (e.g., the probability is 0.12 if three locations are sampled).
Document Type: Research Article
Publication date: 1993-04-01
- 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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