Fungus Gnat
Sciaridae family (various genera like Bradysia, Sciara) or Mycetophilidae family (various genera)
- Order & Family
- Order: Diptera, Family: Sciaridae (dark-winged fungus gnats) or Mycetophilidae (true fungus gnats)
- Size
- Adults are typically 1/8 inch (3-4 mm) long. Larvae are slender, clear or whitish, with a distinctive black head capsule, growing up to 1/4 inch (6-7 mm) long.
Natural Habitat
Fungus gnats are commonly found in indoor environments with houseplants, greenhouses, and other areas with consistently moist soil and decaying organic matter. Outdoors, they can be found in damp, shady areas rich in organic debris.
Diet & Feeding
Larvae primarily feed on fungi and decaying organic matter in moist soil. They may also feed on delicate plant roots, especially on seedlings or plants under stress. Adult fungus gnats do not feed.
Behavior Patterns
Fungus gnats are typically attracted to moist conditions, particularly overwatered plants where fungi and decaying organic matter thrive. Adults are weak fliers and often seen near the soil surface or flying around plants. Larvae live in the soil and feed on fungi and decaying organic matter, and sometimes plant roots.
Risks & Benefits
Risks: While generally harmless to humans, large populations can be a nuisance. Larvae can damage young plant roots, leading to wilting or stunted growth. They can also spread plant pathogens. Benefits: As decomposers, they contribute to the breakdown of organic matter in the soil.