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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.
biological insecticide containing the bacteria Bacillus thuringiensis or Bt. Specifically for control of caterpillars which are the worm like larvae of butterflies and moths. Best used when the larvae are young, actively feeding.