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Appl Environ Microbiol. 1991 August; 57(8): 2277-2282

Toxicity of Bacillus thuringiensis to laboratory populations of the olive fruit fly (Dacus oleae).

Department of Biology, Aristotelian University of Thessaloniki, Salonica, Greece.

ABSTRACT

A survey of Bacillus thuringiensis recovered from the environments of olive groves in Greece was carried out. Of 80 soil samples, 24 were found to contain B. thuringiensis with parasporal crystal inclusions; these were tested for toxicity against the olive fruit fly (Dacus oleae). Mortality levels of larvae caused by the different isolates varied from 7 to 87%. Higher levels of mortality were observed if a mixture of relatively pure crystals and spores was used compared with the mortality resulting from either fraction alone. We were able to show that the toxicity of the most active isolate is likely to be specific for D. oleae.