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The microbial insecticide Bt is a concentrated formulation bacterium that kills the caterpillar stage of moths and butterflies. The active ingredients are spores and toxic crystals produced by the naturally occurring bacteria, Bacillus thuringiensis.
Natural occurrence and use of Bt in New Zealand. Bacillus thuringiensis occurs naturally in New Zealand, especially in soil and insects. Aquatic environments have not been extensively sampled, but strains similar to Bti have. been found in the environment.