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Effects of Temperature on Mortality of Larval Stable Fly (Diptera: Muscidae) Caused by Five Isolates of Bacillus thuringiensis

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We examined the effects of temperature on mortality of larval stable fly [Stomoxys calcitrans (L.)] caused by Bacillus thuringiensis tolworthi 4L3, B. t. darmastedensis 4M1, B. t. thompsoni 401, B. t. thuringiensis HD2, and B. t. kurstaki HD945. At moderate doses, mortality caused by all isolates ranged from 87 to 99% at 15°C and declined to 29‐63% as temperature increased to 30°C. A similar pattern was seen when a higher dose was used, except that the reduction in mortality at warmer temperatures was not as great as was seen with the moderate doses. Insecticidal activity of each isolate against first-instar larvae was reduced by only 5‐15% after 5 d in the medium. Mortality of second- and third-instar larvae ranged from 2 to 21%, suggesting the isolates were less effective against larger larvae.

Keywords: Bacillus thuringiensis; Stomoxys calcitrans; larval mortality; temperature

Document Type: Research Article

DOI: http://dx.doi.org/10.1603/EC11359

Publication date: April 1, 2012

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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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