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White powder Bacillus thuringiensis Insecticide for lepidopterous larvae control Description: Bacillus thuringiensis, which is also called Bt, is an insecticide with stomach action. Following ingestion, the crystals of endotoxin are solubilised; the epithelial cells of the gut are damaged, insects stop feeding and eventually starve to death. Bacillus thuringiensis (or Bt) is a Gram-positive, soil-dwelling bacterium, commonly used as a biological pesticide. B. thuringiensis