Bacillus thuringiensis Berliner is a Gram-positive bacterium that upon sporulation produces a protein crystal toxic to certain pest insects. Strains of B. thuringiensis that affect the larvae of insects in Lepidoptera, Diptera, Coleoptera, and other orders have been identified. However, in general, much of the research that has been conducted using B. thuringiensis is not definitive.
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Phyllis A. W. Martin (1994) studied this question.
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