Suppression of German Cockroach (Orthoptera: Blattellidae) Populations with Cypermethrin and Two Chlorpyrifos Formulations1

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Cypermethrin and two new chlorpyrifos formulations (Dursban LO and ME) were evaluated in the laboratory and field to determine effects on German cockroaches, Blattella germanica (L.). Initially, continuous exposure of adult males on cypermethrin- or chlorpyrifos-treated surfaces for 24 h resulted in total mortality of susceptible cockroaches. Dursban LO was less effective than the ME formulation 2 wk after treatment. Multiresistant cockroaches were more difficult to kill with both chlorpyrifos formulations, but cypermethrin killed 100% of both strains within 30 min. In modified choice arena tests, cypermethrin killed 100% of German cockroaches (susceptible and multi resistant). Chlorpyrifos applied as a micro emulsion (Durban LO) and as a micro encapsulated (Durban ME) formulation resulted in 92% and 95% mortality of susceptible cockroaches and 81% and 39% mortality of resistant cockroaches, respectively. Weekly sampling of populations demonstrated that chlorpyrifos (Durban LO) resulted in significantly fewer cockroaches per harbor ager than untreated controls, whereas chlorpyrifos (Durban ME) results were variable. Field evaluations resulted in percent reductions of 91% for cypermethrin, 66% for chlorpyrifos (Durban ME), and 15% for chlorpyrifos (Durban LO) at 4 wk after treatment.

Document Type: Research Article

Publication date: June 1, 1988

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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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