Fungus Gnat

Natural Habitat

Moist, organic-rich environments, such as potting soil of houseplants, compost piles, and areas with decaying plant material.

Diet & Feeding

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

Behavior Patterns

Adult fungus gnats are weak flyers and are often seen near the soil surface of potted plants or flying around windows. They are attracted to light. Larvae live in the soil and feed for about 2-3 weeks before pupating, then emerge as adults. Their life cycle is relatively short, around 3-4 weeks.

Risks & Benefits

Potential risks include being a nuisance pest indoors, especially to houseplants. Larvae can damage roots of seedlings and young plants, leading to wilting, stunted growth, and even death. They do not bite humans or transmit diseases. Benefits are minimal from a human perspective, but they contribute to decomposition of organic matter in natural environments.

Identified on: 11/29/2025