Effect of pH and Chlorine Concentration on Activity of Bacillus thuringiensis Tank Mixes

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Commercial preparations of Bacillus thuringiensis Berliner mixed with water of pH range 1–13 or with water containing free chlorine concentrations of 0.0–100 ppm were bioassayed against Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough). The natural buffering properties of the B. thuringiensis products caused the pH of the water mixtures to be equivalent to mixtures mixed at a neutral pH (7.0) except at the 2 extreme pH's. No activity losses were found for the pH range tested; however, activity generally declined with storage time. The chlorine concentrations tested had no effect on activity of B. thuringiensis suspensions.

Document Type: Research Article

Publication date: April 1, 1980

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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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