Bacillus thuringiensis subsp. Israelensis (Bti) is an atural larvicide containing BTI against mosquito larvae. Use BTi in all places where mosquitos lay eggs:ponds,watertrays,gutters,trenches… BTi kills larvae in 24 hours before the mosquitos hatch.The water surface continues to trap and kill larvae for aprox.3 weeks. Welcome to visit our official website : http://www.biological-insecticide.com