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1 August 2000 Lack of Toxicity to Adults of the Mexican Fruit Fly (Diptera: Tephritidae) of β-Exotoxin in Bacillus thuringiensis Endotoxin Preparations
David C. Robacker, Jose A. Garcia, Adelaido J. Martinez
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Abstract

β-Exotoxin (thuringiensin) was found in high titers in centrifugation supernatants and acetone/lactose powders produced from centrifugation pellets of strains Guat 1 and HD 2 of Bacillus thuringiensis (Berliner). Diets containing powders of either strain were toxic, diets containing Guat 1 supernatant were not toxic, diets containing HD 2 supernatant were slightly toxic, and diets containing powders or supernatants from uninoculated culturing medium spiked with β-exotoxin were not toxic. Most mortality occurred within 3 d when flies fed on powders but not until 6–7 d when flies fed on HD 2 supernatant. These results indicated that the primary toxic principals of the powders were endotoxins/spores and that β-exotoxin alone was not toxic to adult flies at the concentrations found in the supernatants or powders.

David C. Robacker, Jose A. Garcia, and Adelaido J. Martinez "Lack of Toxicity to Adults of the Mexican Fruit Fly (Diptera: Tephritidae) of β-Exotoxin in Bacillus thuringiensis Endotoxin Preparations," Journal of Economic Entomology 93(4), 1076-1079, (1 August 2000). https://doi.org/10.1603/0022-0493-93.4.1076
Received: 5 August 1999; Accepted: 1 March 2000; Published: 1 August 2000
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