Reviewers consistently rate Mosquito Bits or Mosquito Dunks as the most effective long-term solution. Creating a "tea" by steeping these in water for 24 hours and then watering your plants kills larvae in the soil using BTI bacteria.

Getting rid of gnats effectively requires a dual approach: to stop them from breeding and treating the breeding grounds (soil or drains) to kill larvae and eggs. Best-Reviewed Solutions by Gnat Type 1. Houseplant (Fungus) Gnats These thrive in moist soil and decaying organic matter.

A mixture of 1 part 3% hydrogen peroxide to 4 parts water kills larvae on contact when used for watering.

Weapons of Gnat Destruction: A Guide to Killing Fungus Gnats