Comparative Activity of Fenoxycarh and Hydroprene in Sterilizing the German Cockroach (Dictyoptera: Blattellidae)

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Last-instar German cockroaches, Blattella germanica (L.), were treated topically with the juvenoids, fenoxycarb and hydroprene, and observed for reproductive capabilities during adulthood. Hydroprene had a significantly lower SD50 (dose required to sterilize 50%of the cockroaches) for males (39.82 µg/g body weight) compared with females (86.64 JJ.g/g body weight). In contrast, SD.50's of fenoxycarb did not differ significantly between the sexes (18.04 and 13.66 µg/g body weight for females and males) and were significantly lower when compared with SD50's of hydroprene. A strong positive relationship between wing twisting (a morphogenetic effect caused by juvenoids) and sterility was observed among cockroaches treated with 100 and 10 µg/µl of each juvenoid. However, only 16%of females displaying twisted wings were sterile when treated with 1 µg/µl of hydroprene. Cockroaches treated with 100 µg/µl of hydroprene lived 10-14 wk fewer than control adults and often attempted a sixth (supernumerary) molt..

Document Type: Research Article

Publication date: June 1, 1989

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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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