Graduate Thesis Or Dissertation
 

Interactions and persistence of the mosquitocidal bacteria Bacillus sphaericus and Bacillus thuringiensis var. israelensis

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  • Interactions between Bacillus sphaericus and Bacillus thuringiensis israelensis (Bti), persistence of insecticidal activity in the mosquito habitat, and suitability of enzyme-linked immunoabsorbent assay (ELISA) for detecting and quantifying bacterial endotoxin in the mosquito habitat were investigated. Interactions between the two bacterial species were examined by laboratory and field bioassays with larvae of Culex pipiens. In laboratory bioassays, B. sphaericus and Bti acted independently. Antagonistic interactions occurred with combinations of a low concentration of one bacterium with a high concentration of the second, however. In field bioassays, all interactions between Bti and B. sphaericus were antagonistic. Field bioassays with C. pipiens indicated no persistence of insecticidal activity of either Bti or B. sphaericus after two treatments and persistence of only B. sphaericus after 3 and 4 treatments. Organic matter and high temperatures adversely affected the accuracy of ELISA for detecting and quantifying bacteria in the mosquito habitat and may play a major role in detoxification of bacterial endotoxin in nature.
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