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Temporal Variability in Repeated Bioassays of Field Populations of European Red Mite (Acari: Tetranychidae): Implications for Resistance Monitoring

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Discriminating bioassaysare increasingly being used to detect resistance and estimate the frequency (F) of resistant (R) phenotypes in field populations. The proportion of survivors in discriminating bioassaysis thought to measure the frequency of R phenotypes in the population. External factors that cause physiological stress in a field population may alter response to a discriminating concentration and affect estimates of F. Because esusceptible (S) phenotypes already die at the discriminating concentration, only the response of R phenotypes changes. Thus, estimates of F will be biased and populations under stress will appear to be more susceptible than they really are. Repeated discriminating bioassays of the European red mite, Panonychus ulmi (Koch),showed variability in estimates of F. Repeated bioassays of P. ulmi from commercial apple orchards were used to construct a cumulative distribution function that describes the probability that Rphenotypes die in the discriminating bioassay. This distribution function was then used in simulations to explore the effect of day-to- day variability in tolerance of R phenotypes on resistance monitoring programs.

Document Type: Research Article

Publication date: August 1, 1991

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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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