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Persistence of Bacillus thuringiensis in Two Formulations Applied by Helicopter Against the Western Spruce Budworm (Lepidoptera: Tortricidae) in North Central Oregon

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Inactivation rates of Bacillus thuringiensis were determined for two formulations applied at 20 and 30 billion international units/ha by helicopter against the western spruce budworm, Choristoneura occidentalis Freeman. The number of days before spray residues declined to 50% of original activity varied with the dosage. Because inactivation rates of the four treatments were approximately equal, success of a B. thuringiensis control program apparently depends more on the initial rate of larval mortality than on the persistence of the microbial agent.

Document Type: Research Article

Publication date: February 1, 1987

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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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