Relevance of Resistance Ratios to Operational Control in the German Cockroach (Dictyoptera: Blattellidae)
Author: COCHRAN, DONALD G.
Source: Journal of Economic Entomology, Volume 89, Number 2, April 1996 , pp. 318-321(4)
Publisher: Entomological Society of America
Abstract:A simulated crack and crevice method of exposure to insecticides was developed to ascertain the relationship between mortality produced by field-application rates and resistance ratios obtained by the time-mortality method. Nymphal German cockroaches, Blattella germanica (L.), from strains of widely varying resistance backgrounds were tested with chlorpyrifos, acephate, cyfluthrin, and cypermethrin. I observed an inverse relationship between resistance ratios and 72-h crack and crevice mortality in all 4 cases. Gene frequency estimates paralleled resistance ratios for cyfluthrin and cypermethrin. I concluded that time mortality resistance ratios provide a good indication of the level of resistance in a given strain, and that resistance ratios >3.0 signal potential control failures in the field.
Document Type: Research Article
Publication date: April 1996
- 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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