Fungus Gnats: Identification and Control Strategies

Small flying bugs emerging from plant soil across multiple rooms—worse after watering—are fungus gnats. They're more nuisance than threat, but persistent.

Understanding the Life Cycle

Adults live 2–3 days; larvae (tiny, worm-like) live in soil and feed on organic matter and roots. Control must target larvae for lasting results.

Control Methods

• Beneficial nematodes: Most effective biological control—apply to soil to kill larvae.
• Malathion drench (2%): Chemical option for severe cases.
• Raw potato slices: Place on soil; larvae enter; discard and replace daily.
• Soapy water traps: Bowls of water + dish soap near plants catch adults; change daily.

Prevention

Allow soil to dry between waterings. Fungus gnats thrive in constantly moist conditions. Improve drainage and avoid overwatering.