Rick from Anacortes,wa writes
MotherEarth 2% Py Contact Aerosol - 17.5 oz. is not labeled to treat gnat larvae in soil. MotherEarth 2% Py Contact Aerosol - 17.5 oz. is a botanical insecticide that leaves no residual and should pose zero harm to plants.
Answer last updated on: 07/11/2013