Is Bt Safe for Organic Gardening?

Bt (Bacillus thuringiensis) is recognized in organic farming as an insecticide, and for more than 50 years, Bt proteins have been used as microbial control agents (MCPA) on a variety of organic farms. So, is Bt suitable for organic farming? According to the EPA (U.S. Environmental Protection Agency), there is no human health risk associated…