Btk (Bacillus thuringiensis var. kurstaki) is an organic insecticide that contains a naturally-occurring bacterium found in soil. Btk, when applied at recommended rates, does not harm people, plants, ...

Bacillus thuringiensis is a Gram positive, soil-dwelling bacterium. Like all Bacillus species, it is rod-shaped and produces spores. Aside from being a close relative to Bacillus anthracis (the one ...