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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.
Thus, over the last 40 years, Bt has been used as an insecticide by farmers worldwide. Organic farming in particular has benefited from Bt insecticide, as it is one of the very few pesticides permitted by organic standards. The insecticide is applied either as a spray, or as ground applications.