Fungus Gnat

Natural Habitat

Damp, shaded environments rich in decaying organic matter, especially in potted plants or areas with high humidity. Indoors, they are commonly found near houseplants.

Diet & Feeding

Larvae feed on fungi, root hairs, and decaying organic matter in the soil. Adult fungus gnats do not feed significantly and typically live only about a week.

Behavior Patterns

Adults are weak fliers and are often seen hovering around potted plants or running across surfaces. They are attracted to light and moisture. Females lay eggs in moist soil, and the larvae develop in the soil, feeding before pupating and emerging as adults. Their life cycle from egg to adult is usually 3-4 weeks.

Risks & Benefits

Potential risks include being a nuisance pest indoors, especially when populations are high. Larvae can cause damage to plant roots, particularly in seedlings and young plants, leading to wilting or stunted growth. They do not bite humans or transmit diseases. No significant benefits to humans, though they play a minor role in decomposition in natural ecosystems.

Identified on: 10/6/2025