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Effectiveness of Bacillus thuringiensis and Several Chemical Insecticides for Control of Budworms and Hornworms on Tobacco1

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In a field experiment conducted at Florence, S. C., in 1960, a commercial Bacillus thuringiensis Berliner spore material containing 93x109 spores per gram gave good control of the tobacco hornworm (Protoparce sexta (Johannson)) and the tobacco budworm (Heliothis virescens (F.)) on tobacco. Hand applications of the spore material, either undiluted or in a cornmeal bait, to the terminal buds gave as good or better control than sprays containing ThiodanĀ® (6,7,8,9,10, 10-hexachloro-1,5,5a,6,9,9a-hexahydro- 6,9,-methano-2,4,3-benzodioxathiepin-3-oxide), endrin, or Shell SD-4402 (1,3,4,5,6, 7,8,8-octachloro-8a,4, 7,7a-tetrahydro- 4,7-methanophthalan), but caused injury to tender foliage. A bacillus suspension spray was less phytotoxic and equal to the chemical insecticides in protecting the plants from the caterpillars. Combinations of the bacillus and either SD-4402 or Thiodan were usually no better than the bacillus alone.

Document Type: Research Article

Publication date: December 1, 1961

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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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