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Induction of Wing Twisting Abnormalities and Sterility on German Cockroaches (Dictyoptera: Blattellidae) by a Juvenoid Pyriproxyfen

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Abstract:

Contact activity of pyriproxyfen, evaluated on 4th-instar nymphs of German cockroach, Blattella germanica (L.), was found to be effective in inducing morphogenetic wing deformation abnormalities on both sexes of the cockroach. A dose-response study based on a rating system for morphological wing deformations in adults after exposure to pyriproxyfen showed that the 50% effective dose (ED50) for wing twisting effects in male and female B. germanica were 0.4-0.5 and 0.4-0.7 mg (AI)/m2, respectively. There was a good correlation between physical wing twisting effects in adults induced by pyriproxyfen and inhibition of reproduction (correlation coefficient, r = 0.98). The 50% sterility dose (SD50)of pyriproxyfen against the German cockroaches was 0.05 mg (AI)/m2. Of the portion of cockroaches unaffected by pyriproxyfen, the oothecal incubation period and sex ratio of the offspring appeared normal.

Document Type: Research Article

Publication date: October 1, 1996

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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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