Evaluation of the Influence of Droplet Size and Density of Bacillus thuringiensis Against Gypsy Moth Larvae (Lepidoptera: Lymantriidae)

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A study was conducted to determine the effect of spray droplet size and density on the efficacy of a commercial preparation of Bacillus thuringiensis against the gypsy moth (Lymantria dispar L.). A concentration of 5,795 International Units (IU)/µl was used. In the laboratory, various size droplets and densities were tested against larvae using 12-cm2 red oak leaflets. Results show that producing relatively high densities of small (50- 150 µm) droplets of B. thuringiensis will increase the efficacy compared with larger droplets (> 150 µm) present at low densities at the same dose. Median lethal dose estimates are made for droplets in three size classes(50-150, 150-250, and 250-350 µm). LD95's for the generalized size classes of 100, 200, and 300 µm were 10.8, 2.2, and 0.9 drops/em2, respectively. Implications of these results are discussed.

Document Type: Research Article

Publication date: February 1, 1988

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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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