Effects of seven bioinsecticides, containing Bacillus thuringiensis and B. sphaericus toxins, against N. braziliensis larvae were studied in vitro. Bitoxibacillin, astur-3, astur-4, gomelin, lepidocide, dendrobacillin, thuringin and sphaerix were found highly effective larvicides. Protein endotoxin was the principal component responsible for the larvicidal effect, the spores were of no importance.

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