Larvicidal and Ovicidal Activity of Dimilin® Against Simulium vittatum

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The IGR Dimilin® [1-(4-chlorophenyl)-3- (2.6-diflurobenzoyl) urea] was bioassayed against late-instar larvae of Simulium vittatum Zetterstedt in a conical-flushing bioassay unit. When the 25% WP, 5% EC, and 25% FC of Dimilin were compared for effectiveness, it was found that the WP and FC were significantly more efficacious than the EC. LC95 values (rounded) for larvae exposed to WP for 15 min, 60 min, and 24h were 0.7, 0.2, and 0.03 ppm, respectively.

Exposure of 24–48h S. vittatum eggs to Dimilin WP at 1.0 ppm for 1 h almost completely inhibited hatching; however, the mortality rate of eggs 72 h old or more was considerably lower. No pupicidal activity of Dimilin was detected at conen of 10 ppm for a 24-h exposure.

Document Type: Research Article

Publication date: June 1, 1977

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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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