Natural Fungus Gnat Death Drops are a microbial insecticide effective against fungus gnats. It is an EPA approved product. The active ingredient is BTI: Bacillus thuringiensis subspecies israelensis Strain BMP 144.  To treat fungus gnats, apply Natural Fungus Gnat Death Drops as a drench to sufficiently wet the surface of the growth medium of ornamental plants, vegetables, or herbs. Use 8-16 fl. oz of Natural Fungus Gnat Death Drops/100 gal of water (0.5-1tsp of Natural Fungus Gnat Death Drops/gal of water)Where infestations (adults, eggs, pupae, and larvae) are present, reapply regularly. Routine use of lower rates will keep populations to a minimum. For safety questions please see our full Safety Data Sheet