How to do it:
Use a DIY prevention method by covering the soil surface with a 1/2-inch layer of sand or fine gravel to deter adult fungus gnats from laying eggs. Allow the top inch of soil to dry out between waterings, and use yellow sticky traps to catch adult gnats.

Result:
This method reduces fungus gnat populations and helps protect your goods from damage.

Problem:
If the soil remains too moist or the sand layer is too thin, gnats may still breed, making the method less effective.

How to do it:
Mix 1 part apple cider vinegar with 2 parts water in a shallow dish. Add a few drops of liquid dish soap. Place the dish near affected goods.

Result:
Fungus gnats are attracted to the vinegar, get trapped by the soap, and drown, reducing their population.

Problem:
If the infestation is severe or the source of moisture isn’t addressed, gnats may persist despite the trap.

How to do it:
Physically remove adult fungus gnats and larvae from affected areas. Use sticky traps to catch adults and manually remove infested soil. Cover soil with a layer of sand or fine gravel to block egg-laying.

Result:
Reduces gnat population and prevents further infestation, protecting your goods from damage.

Problem:
Method may fail if hidden larvae or eggs remain, or if gnats migrate from untreated areas.

How to do it:
Use beneficial nematodes (Steinernema feltiae) as a biological control to target fungus gnat larvae in soil.

Result:

• Mix nematodes with water as per package instructions.
• Water your houseplants with the solution.
• Repeat every 2-3 weeks for ongoing control.
• Nematodes infect and kill fungus gnat larvae, reducing their population.

Problem:
This method may fail if soil dries out, as nematodes need moisture to survive and move. High temperatures or direct sunlight can also reduce their effectiveness.

How to do it:
Mix 1 tablespoon of hydrogen peroxide (3%) with 1 liter of water. Water the soil with this solution once a week to kill fungus gnat larvae. Use sticky yellow traps above the soil to catch adult gnats. Allow the top inch of soil to dry between waterings to prevent egg-laying.

Result:
Reduces fungus gnat population and prevents further damage to goods.

Problem:
Method may fail if soil remains too moist, if hydrogen peroxide concentration is too low, or if infestation is severe.