Fungus Gnat
Scientific Name: Bradysia spp. (most common) or sometimes Lycoriella spp.
Order & Family: Diptera, Sciaridae (dark-winged fungus gnats) or Mycetophilidae (true fungus gnats)
Size: Adults are typically 1/8 to 1/4 inch (2-4 mm) long.
Natural Habitat
Moist, humid environments, commonly found indoors near houseplants, in greenhouses, mushroom farms, and anywhere there's consistently damp soil or rotting organic material.
Diet & Feeding
Larvae primarily feed on fungi, decaying organic matter, and sometimes plant roots. Adult fungus gnats do not feed.
Behavior Patterns
Fungus gnats are attracted to moist environments, particularly decaying organic matter or overly wet soil. Adults are weak fliers and often seen near potted plants. Larvae feed on fungi and decaying plant material in the soil.
Risks & Benefits
Generally considered a nuisance pest, but large infestations can cause damage to seedling and young plant roots. They do not bite humans or transmit diseases. Their larvae help in breaking down organic matter in soil.
Identified on: 9/4/2025