Fungus Gnat

Natural Habitat

Damp, organic-rich environments, often indicated by the presence in potted plants, compost piles, and humid indoor spaces. Larvae live in soil.

Diet & Feeding

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

Behavior Patterns

Adults are weak fliers and are often seen walking on surfaces or flying erratically near plants. They are attracted to light. Females lay eggs in moist soil. Larvae develop in the soil, feeding on organic matter and roots, then pupate in the soil.

Risks & Benefits

Potential risks include damage to plant roots (especially seedlings and cuttings) by larvae, which can lead to plant stress or death. They are generally harmless to humans but can be a nuisance indoors. They can also contribute to nutrient cycling in soil through their feeding habits on decaying matter.

Identified on: 9/16/2025