Efficacy of Ground Application of the Gypsy Moth (Lepidoptera: Lymantriidae) Nucleopolyhedrosis Virus Product, Gypchek

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Low and moderate density gypsy moth (Lyman tria dispar L.) populations in eastern Maryland were treated with the nucleopolyhedrosis virus product, Gypchek, using ground hydraulic equipment. A tank mix containing Orzan LS-50 (12% by vol) as a sunlight protectant, and Rhoplex B60A (2% by vol) as a sticker, was applied to six woodlots at the rate of 378 liters and 2.5 x 1012 polyhedral inclusion bodies per ha. This rate reduced numbers of egg masses by 81% compared with numbers in six control woodlots. Larval mortality was significantly higher in treated than in control woodlots, but defoliation differences between sprayed and control woodlots were not significant. Foliage collected 14 d after spray retained sufficient activity to kill up to 38% of gypsy moth larvae in laboratory bioassays.

Document Type: Research Article

Publication date: April 1, 1991

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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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