Gypsy Moth Control with Dimilin® Sprays Timed to Minimize Effects on the Parasite Apanteles melanoscelus

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Dimilin® (1- (4-chlorophenyl) -3- (2,6 difluorobenzoyl). urea), an insect growth regulator, was applied by mist blower at 0.0078 lb AI/10 gal water to gypsy moth, blower at 0.0078 lb AI/10 gal water to gypsy moth, Lymantria dispar L., infested apple trees on 3 spray dates when gypsy moth larvae were in stadia 1 and 2, 2 and 3, and 3 and 4, respectively. Percent larval mortality was high on all 3 spray dates. The 1st spray resulted in decreased percent emergence of the larval parasite, Apanteles melunoscelus (Ratzeburg), from the gypsy moth host, while the 2nd and 3rd sprays did not.

Six rates of Dimilin between 0.0078 and 0.00025 lb AI/10 gal water were applied similarly on May 29, 1975. Mortality data yielded a significant concentration-response curve for the gypsy moth with the higher rates being comparable in effectiveness to carbaryl at 0.5 lb AI/10 gal water. Residual activity of Dimilin was high for 2 weeks as opposed to one week for carbaryl.

Document Type: Research Article

Publication date: June 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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