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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.
Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a biological pesticide.pores and crystalline insecticidal proteins produced by B. thuringiensis have been used to control insect pests since the 1920s and are often applied as liquid sprays. They are now used as specific insecticides under trade names such as DiPel and Thuricide.