Biolep is a biological insecticide formulated based on the entomopathogenic bacterium, Bacillus thuringiensis subsp. kurstaki. The bacteria produce a crystal protein during sporulation that is specifically lethal to larval stage of Lepidoptera. Shortly after ingestion by the larvae, the protoxin is released following crystal dissolution and the toxin is activated in the gut environment, where it begins to break down the gut. Infected larvae become black and die within 24-72 hours after exposure. Biolep is an oral compound with no detrimental effect on non-target organisms, including natural enemies, pollinators, and human.