Effects of the Insect Growth Inhibitor, Dimilin,® on Hatching of Mosquito Eggs

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Exposure of egg rafts of the southern house mosquito, Culex pipiens quinquefasciatus Say, to water treated with Dimilin® [1-(4-chlorophenyl) -3- (2,6-difluorobenzoyl)-urea] induced abnormal side-hatching as well as ovicidal action. The activity was influenced by the age of the embryos at the time of treatment; younger embryos (preblastoderm stage) were the most sensitive and 7-, to 23-h-old embryos were more tolerant. The side-hatching and ovicidal phenomena also were produced by baiting adults with Dimilin in sucrose. In this instance, females were more sensitive than males.

Ovicidal and abnormal hatching due to baiting with Dimilin was likewise exhibited in Culex tarsalis Coquillett and Aedes taeniorhynchus (Wiedemann).

Document Type: Research Article

Publication date: October 1, 1976

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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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