Fungus Gnat

Scientific Name: Family Sciaridae

Order & Family: Order: Diptera; Family: Sciaridae

Size: 1 to 7 millimeters (about 1/16 to 1/8 inch)

Fungus Gnat

Natural Habitat

Damp environments rich in decaying organic matter, such as houseplants, greenhouses, and moist soil.

Diet & Feeding

Larvae feed on soil fungi, algae, and decaying plant material; adults do not feed or consume only liquids like nectar.

Behavior Patterns

Weak fliers that often stay near the soil surface. They have a short lifespan of about one week but reproduce rapidly in moist conditions.

Risks & Benefits

Generally harmless to humans but can be a nuisance. Larvae may damage plant roots in heavy infestations; benefits include aiding in the decomposition of organic matter.

Identified on: 12/31/2025