Will fly spray kill fungus gnats?
Correspondingly, how do you get rid of gnats in potting soil?
Apply organic pest control products – Pour or spray an organic insecticidal soap or a soapy water mix (I use Dr. Bronner's Baby-mild Liquid Soap) or neem oil mixture into the top of the soil to kill gnats in potted plants.
Correspondingly, what kills fungus gnats?
Mix one part 3% hydrogen peroxide with four parts water. Allow the top layer of your soil to dry, and then water your plants with this solution as you normally would. The soil will fizz for a few minutes after application; this is normal. Contact with hydrogen peroxide will kill fungus gnat larvae on contact.
To get rid of fungus gnats, mix a solution of 1 part of hydrogen peroxide with 4 parts of water. You should only water your house plant with this solution when the top of the potting medium is dry. When you pour the peroxide solution into the soil, you might hear an effervescent sound.