Fungus Gnat

Scientific Name: Sciaridae (various species)

Order & Family: Diptera (Flies), Sciaridae (Dark-winged fungus gnats)

Size: 2-8 mm (adults)

Fungus Gnat

Natural Habitat

Damp, organic-rich environments, often found near houseplants, greenhouses, or decaying organic material.

Diet & Feeding

Larvae feed on fungi and decaying plant matter in the soil; adults typically do not feed or feed on liquids.

Behavior Patterns

Adults are weak fliers and are often seen walking on soil or plant leaves. Larvae live in the soil. They are attracted to light.

Risks & Benefits

Potential risks include damage to plant roots by larvae, particularly in young seedlings or unhealthy plants. They can be a nuisance indoors. Generally, they are not harmful to humans. Benefits include aiding in decomposition of organic matter in outdoor environments.

Identified on: 10/10/2025