May 02, 2007 — The bacteria BTI is very specific. Aside from black flies, it can also be used to kill mosquito larvae in standing water. BTI was isolated in the 1970s in Israel, hence its name, Bacillus thuringiensis israelensis. It was first used to reduce mosquito- and fly-borne diseases. To learn more, David spoke with the leading authority on BTI in New York, Dr. Daniel Molloy. He's an aquatic biologist with the New York State Museum. He says BTI produces protein crystals.