Further Field Experiments on the Use of Bacillus thuringiensis and Chemical Insecticides for the Control of the European Corn Borer, Ostrinia nubilalis, on Sweet Corn in Southwestern Quebec


Source: Journal of Economic Entomology, Volume 56, Number 6, December 1963 , pp. 804-808(5)

Publisher: Entomological Society of America

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In 1961, two preparations of Bacillus thuringiensis Berliner, one, Thuricide® (30X109 spores per g.) and the other Bakthane® L69 (75X109 spores per g.), both used at 2 Ib of wettable powder per acre were compared with: DDT, 1½ Sevin® (1-naphthyl N -methylcarbamate), l lb; Sevin 4 flowable, l lb; Kepone® (decachlorooctahydro-1,3,4-metheno-2H-cyclobuta [cd] pentalen- 2-one), 1 lb; Dylox® (O,O-dimethyl 2,2,2-trichloro-1-hydroxyethyl phosphonate), 1½ EPN (O-ethyl O-p-nitrophenyl phenylphosphonothioate), 1 lb; Zectran® (4-dirnethylamino- 3,5,-xylyl methylcarbamate), 1 lb; Bakthane L-69 2 lb plus half dosage of DDT. In 1962, two preparations of B. thuringiensis at 2 lb per acre, 2 lb plus half dosage of DDT, were compared with DDT at 1 and 1.5 lb, Sevin, Dylox, Kepone, EPN, Zectran at the 1961 dosages, Bayer 44646 (4-dimethylamino-m-tolyl methylcarbamate), l lb and Thiodan® II (hexachlorohexahydro- 6,9-methano benzodioxathiepin-3-oxide), 1 lb per acre for the control of the European corn borer, Ostrinia nubilalis (Hübner), on sweet corn in southwestern Quebec. Each year, in mid-July, two applications were made at a week interval with a conventional tractor-pulled sprayer. Percent infested plants and ears and numbers of borers in the plants were obtained by dissecting at harvest 25 corn plants per replicate per treatment. In general, results were similar for the two years and none of the materials tested were phytotoxic at the doses used in these experiments. In 1961, all treatments gave more than 94% marketable ears. DDT, EPN, Sevin and Dylox reduced the number of larvae in the plants by 7Q% or more; the Bakthane L-69-DDT mixture and Thurieide, 69%; Sevin flowable, Zectran, Kepone and Bakthane L-69, from 54.7% to 64.3%. In 1962, all treatments gave more than 96% marketable ears. EPN reduced the number of larvae in the plants by 97.9%; Thuricide, DDT, Dylox, Bak- -thane L-69, Bayer 44646, from 80.9% to 89.3%; Kepone, Zectran, the Bakthane I,-69-DDT mixture, from 72.4% to 78.6%; Sevin, 68.1%. Thiodan II, 53.3%. In 1961, 77.9% of the

Document Type: Research Article

Publication date: December 1, 1963

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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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