Fungus Gnat

Natural Habitat

Damp, organic-rich environments, often associated with potted plants, decaying organic matter, and moist soil. They thrive indoors where conditions are ideal.

Diet & Feeding

Larvae feed on fungi, decaying plant matter, and plant roots, especially in moist or over-watered soil. Adults do not feed significantly and primarily focus on reproduction.

Behavior Patterns

Adult fungus gnats are weak flyers and are often seen near potted plants, windows, or lights. They have a short lifespan of about 7-10 days. Females lay eggs in moist soil, and larvae develop within the soil, feeding before pupating. The entire life cycle can be completed in about 3-4 weeks depending on conditions.

Risks & Benefits

Potential risks: Larvae can damage plant roots, especially seedlings and young plants, leading to wilting and poor growth. They are generally considered a nuisance pest indoors. They do not bite humans or transmit diseases. Benefits: In natural ecosystems, they contribute to decomposition of organic matter, but their presence indoors is usually indicative of overwatering or excessive moisture.

Identified on: 9/25/2025