Bug Identifier
Fungus Gnats
Community identification

Fungus Gnats

Bradysia spp., Sciara spp., and others

Order & Family
Diptera, Sciaridae and Mycetophilidae
Size
1/16 to 1/8 inch (2-3 mm) in length
See this bug in the Encyclopedia

Natural Habitat

Damp, organic-rich environments, especially potted plants, greenhouses, and compost piles. They are attracted to moist soil and decaying plant matter.

Diet & Feeding

Adult fungus gnats typically do not feed or feed on liquids. Their larvae feed on fungi, decaying organic matter, and plant roots.

Behavior Patterns

Adults fly in a seemingly aimless fashion, often close to the soil surface or around windows. Females lay eggs in moist soil. Larvae develop in the soil, feeding on organic material. They are often a sign of overwatering.

Risks & Benefits

Risks: Larvae can damage plant roots, especially in seedlings and young plants, leading to wilting, stunted growth, or plant death. They can be a nuisance indoors. Benefits: In natural environments, they contribute to the decomposition of organic matter, aiding in nutrient recycling.