Fungus Gnat
Scientific Name: Various species, often Bradysia spp. (for dark-winged fungus gnats) or Mycetophila spp.
Order & Family: Order: Diptera, Family: Sciaridae (dark-winged fungus gnats) or Mycetophilidae (fungus gnats)
Size: Adults are typically 1/16 to 1/8 inch (2-3 mm) long.
Natural Habitat
Moist soil, especially in potted plants, greenhouses, and other areas with high humidity and decaying organic matter. They are commonly found indoors.
Diet & Feeding
Adult fungus gnats typically do not feed or feed on liquids. Larvae feed primarily on fungi, decaying plant matter, and sometimes plant roots, especially in overwatered conditions.
Behavior Patterns
Fungus gnats are attracted to moist environments, especially near potted plants. Adults are weak flyers, often found near the soil surface or resting on leaves. Larvae live in the soil and feed on fungi and decaying organic matter.
Risks & Benefits
Risks: Primarily a nuisance pest indoors. Large infestations of larvae can damage plant roots, especially seedlings or unhealthy plants. They do not bite humans or transmit diseases. Benefits: In natural ecosystems, they play a role in decomposition and nutrient cycling.
Identified on: 8/19/2025