Fungus Gnat

Damp, organic-rich environments, such as potting soil of houseplants, greenhouses, compost piles, and decaying organic matter outdoors. Adults are often seen flying near potted plants or windows.

Larvae feed on fungi, decaying organic matter, and sometimes plant roots (especially delicate seedlings or unhealthy plants). Adults do not feed significantly and primarily focus on reproduction.

Adult fungus gnats are weak, erratic fliers and are attracted to light. Females lay tiny eggs in moist soil. Larvae develop in the soil, feeding on organic matter, and then pupate in the soil. The life cycle can be completed in about 3-4 weeks depending on temperature and humidity, leading to overlapping generations and continuous presence in favorable conditions.

Risks: Larvae can damage plant roots, especially in young seedlings or stressed plants, leading to wilting, stunted growth, or death. They are primarily nuisance pests indoors. Benefits: Adult fungus gnats can serve as pollinators for some plants, and larvae contribute to decomposition of organic matter in outdoor ecosystems.