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Single Applications of High Concentrations of Bacillus thuringiensis for Control of Gypsy Moth (Lepidoptera: Lymantriidae) Populations and Their Impact on Parasitism and Disease

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In aerial spray trials with Bacillus thuringiensis Berliner conducted against dense populations of Lymantria dispar (L.), single applications of 12 and 16 BIU/0.4 ha gave significant reductions in larval density and excellent foliage protection. Less than 4% net defoliation was observed in treated plots, compared with 69% in untreated plots; this level of control was equivalent to that achieved with two weekly applications at 8 BIU/0.4 ha. Good results were attributed to the formulation, application before the majority of larvae had matured beyond the 2nd in star, thorough spray coverage, and use of an effective sticker. Observations on the natural prevalence of nucleopolyhedrosis virus and parasitism by larval and pupal parasitoids in the treated gypsy moth populations indicated a good compatibility of B. thuringiensis with the major natural enemies which help regulate the population.

Document Type: Research Article

Publication date: December 1, 1983

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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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