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Choosing the Optimal Diagnostic Dose for Monitoring Insecticide Resistance

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We developed a model to investigate the best conditions for conducting diagnostic dose tests to monitor insecticide resistance when dose-response lines of the susceptible and heterozygous strains overlap. In the model, x2 analysis and a one-tailed Z test were used to test the accuracy or power of the experiment. Seven independent factors (slope, resistance factor, frequency of resistance, inheritance of resistance, dose, number of susceptible strain insects, and number of test strain insects) contributed to a test's potential accuracy. Only dose and number of insects treated can be altered by the scientist to improve a test's accuracy. With two exceptions-dose and sample size-the accuracy of the test will be higher as the numerical value of any factor increases. Under our conditions, accuracy decreased as dose approached 100% mortality of the susceptible strain. This relationship suggests that, in the absence of a discriminating dose that has been shown to distinguish genotypes, use of slightly lower doses that do not kill an extremely high proportion of susceptible insects may be preferable.

Document Type: Research Article

Publication date: August 1, 1990

More about this publication?
  • 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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