Fungus Gnat

Natural Habitat

Damp, moist environments rich in decaying organic matter, especially common around houseplants, greenhouses, and compost piles.

Diet & Feeding

Adult fungus gnats feed on liquid, while larvae feed on fungi, decaying plant matter, and sometimes plant roots.

Behavior Patterns

Adults are weak fliers and often seen near the soil surface of potted plants or around windows. Larvae live in the top inch or two of soil. They have a relatively short life cycle (about 3-4 weeks from egg to adult).

Risks & Benefits

Potential risks: Larvae can damage plant roots, particularly seedlings and young plants, leading to wilting and poor growth. They are generally considered a nuisance pest in homes. Benefits: They can aid in the decomposition of organic matter in outdoor environments, but are mostly considered a pest indoors.

Identified on: 9/23/2025