Let the top 1–2 inches of soil dry out between waterings
Reduce watering frequency and avoid overwatering
Remove standing water from saucers and trays
Replace the top layer of infested soil with fresh, dry soil
Repot heavily infested plants with sterile potting mix
Cover the soil surface with a layer of sand, diatomaceous earth, or fine gravel
Use yellow sticky traps near the plant
Apply BTI to the soil according to label directions
Use hydrogen peroxide diluted with water on the soil
Remove decaying leaves, mulch, and plant debris from the soil surface
Quarantine infested plants from healthy plants
Improve drainage in pots and containers
Check for fungus gnat larvae in new potting soil before use
Keep indoor plants in brighter light when possible
Use bottom watering when appropriate and still allow soil to dry
Empty and clean drip trays regularly