Bug Identifier
Fungus Gnat
Community identification

Fungus Gnat

Sciaridae or Mycetophilidae (various species)

Order & Family
Diptera, Sciaridae or Mycetophilidae
Size
2-8 mm
See this bug in the Encyclopedia

Natural Habitat

Damp, organic-rich environments such as potting soil, compost, decaying leaves, and areas with mold or fungi. Commonly found indoors near houseplants.

Diet & Feeding

Larvae typically feed on fungus, decaying organic matter, and plant roots (especially fine root hairs). Adult gnats do not feed significantly or may feed on liquids.

Behavior Patterns

Adults are often seen flying around houseplants, windows, or light sources. They are weak flyers. Larvae live in the soil and are responsible for any plant damage. Their life cycle from egg to adult is relatively short, often 3-4 weeks, leading to rapid population growth if conditions are favorable (moist soil).

Risks & Benefits

Risks: Can be a nuisance indoors. Larvae can damage the roots of seedlings and young plants, leading to wilting, stunted growth, and even plant death in severe infestations. They do not bite humans or transmit diseases. Benefits: As decomposers, their larvae help break down organic matter in outdoor environments.