The Q&A Archives: Fungus gnat killer

Question: Hello, I have a problem with fungus gnats that breed in my soil. I asked for advice on how to get rid of them since they breed in moist soil. I was told that using sand layers on the soil would help and it did to some degree, but they are still laying their eggs in the moist sand. You see I have tropical plants that require daily misting for humidity requirments so the sand does not have time to dry. I heard that a product called Gnatrol can be used to flush the gnats and their eggs out. The problem is I can not find a store that has it. Can you help me out? I have been trying to exterminate them, but they seem to be very tough to get rid of because they are constantly breeding. Please help me win this war.

Answer: Here is one online source for Gnatrol - I'm sure there are others:

Before buying though, you might try temporarily covering the soil with plastic wrap or aluminum foil. This is an effective barrier and once you've eliminated the current population of fungus gnats, your plants (and home) should be fungus gnat free. You run the risk of reintroducing the pests each time you bring home a new plant so be sure to cover the soil surface of any new plants for 2-3 weeks just to make sure there are no hitchhikers. Best wishes with your indoor garden!

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