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Aerial Applications of a Nucleopolyhedrosis Virus and Bacillus thuringiensis Against the Douglas Fir Tussock Moth

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Efficacy of applications of a nucleopolyhedrosis virus (NPV) and Dipel (Bacillus thuringiensis Berliner) against Orgyia pseudotsugata (McDunnough) was determined on replicated field plots of 20 acres in size. Population reductions exceeded 95% at 35 days on plots treated with NPV dosages of 100×109 and at 100×1010 polyhedra/acre in 2 gal/acre of a 25% molasses formulation. Application of Dipel at 1 lb/acre in 25% molasses was as effective as the NPV. These treatments also provided excellent foliage protection, with estimated defoliation levels below 25%. In contrast, Dipel formulated in BioFilm® failed to reduce larval densities to a satisfactory level or to prevent severe defoliation.

Document Type: Research Article

Publication date: April 1, 1975

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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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