Methods for detecting resistance to chlorpyrifos and cypermethrin in the German cockroach, Blattella germanica (L.), were evaluated. Results from the tarsal-contact method (jar test) are greatly influenced by the amount of insecticide used. In tests with high levels of insecticide, little or no resistance was detected. By using less insecticide, the existence of resistance was revealed. Recognition of this fact allows discrepencies between the lethal dose, lethal concentration, and lethal time methods to be largely resolved. These findings indicate that caution must be exercised in the use of the jar test to avoid misinterpretation of the results.
Document Type: Research Article
Publication date: December 1, 1997
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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.