Comparison of Bacillus thuringiensis Berliner var. thuringiensis and Chemical Insecticides for Control of the Alfalfa Caterpillar1

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Commercial preparations of Bacillus thuringiensis Berliner var. thuringiensis and chemical insecticides were applied on alfalfa to control the alfalfa caterpillar, Colias eurytheme Boisduval. Application problems were encountered where ground equipment was used because certain microbial preparations clogged the nozzles. In high concentrate-low volume sprays the wettable powder pathogenic materials are more suitably applied by aircraft where each nozzle orifice is large and the spray droplets are further broken by rapidly moving air currents. When applied at the rate of 6 ounces in 10 gallons of water per acre the wettable powder bacillus products gave satisfactory results that were comparable to 2-ounce Phosdrin® (a mixture of the alpha isomer of 2-carbolllethoxy-1-methylvinyl dimethyl phosphate (not less less than 60%) and related compounds (not more than 40%)) and 5-ounce Dylox® (O,O-dimethyl 2,2,2-triebloro-1-hydroxyethyl phosphonate) treatments. There was rapid mortality of late-instar larvae, which are the most injurious to alfalfa, and subsequently, early instars were unable to continue development.

Document Type: Research Article

Publication date: December 1, 1962

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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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