Fungus Gnat
Sciaridae or Mycetophilidae (familial groups)
- Order & Family
- Order: Diptera, Families: Sciaridae, Mycetophilidae, and others
- Size
- 1-8 mm (most commonly 2-3 mm)
Natural Habitat
Damp, organic-rich environments such as overwatered potted plants, greenhouses, compost piles, and areas with decaying plant matter. Indoors, they are often associated with houseplants.
Diet & Feeding
Larvae primarily feed on fungi, decaying organic matter, and plant roots (especially fine root hairs). Adult fungus gnats do not typically feed or feed on liquids such as nectar.
Behavior Patterns
Adults are weak fliers and are often seen near the soil surface of potted plants, windows, or lights. Larvae live in the soil. They typically have a life cycle of about 3-4 weeks. They are attracted to light and moisture.
Risks & Benefits
Potential risks: Larvae can damage plant roots, especially in seedlings and young plants, leading to wilting, stunted growth, and yellowing leaves. They are generally considered a nuisance pest indoors. They do not bite humans or transmit diseases. Potential benefits: In natural environments, they contribute to the decomposition of organic matter, aiding in nutrient cycling.