Fungus Gnat

Natural Habitat

Damp environments, particularly in houseplants with overwatered soil, greenhouses, and near decomposing organic matter.

Diet & Feeding

Larvae feed on soil fungi, algae, and organic matter, occasionally consuming plant roots. Adults do not feed or only consume liquids.

Behavior Patterns

Weak fliers that are often seen scurrying on soil surfaces or flying near windows/light sources. They have a short lifecycle of about 3 to 4 weeks.

Risks & Benefits

Generally harmless to humans but can be a nuisance indoors. Larvae can damage the root systems of young seedlings or houseplants if populations are high.

Identified on: 2/20/2026