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Isolation of Bacillus thuringiensis for microbiological control of insects.

Eleven of 180 local isolates, belonging to Bacillus thuringiensis, were tested for their pathogenicity to pinkbollworm larvae (Pectinophora gossypiella). Three strains, namely RS-25, RS-35, and RS-45, showed a positive insecticidal activity. Their activities based on the crystalline inclusion bodies. The LD50 (hours) for larvae was 8, 12, and 6 hours, respectively.

Animals