Aerial Application of Bt Against Spruce Budworm: 1982 Bt Cooperative Field Tests—Combined Summary

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Three dosages (20, 30, 40 × 109 IU [AI]/ha) and two rates (4.7 and 9.4 liters/ha) of the Bacillus thuringiensis (Bt) product Thuricide 48B were applied aerially in Maine, Vermont, and Michigan. One dosage (30 × 109 IU[AI]/ha) and three rates (2.4, 4.7, and 9.4 liters/ha) were applied in Ontario. Percentage of foliage protection and population reduction in the United States were significantly better in all Bt treatments than in the controls, but Bt treatments were not significantly different from each other. In Ontario, all rates were not significantly different from the controls (P = 0.05). A relationship between Bt effectiveness and dose-volume was not evident in this test.

Document Type: Research Article

Publication date: August 1, 1984

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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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