Fungus Gnat

Natural Habitat

Damp, organic-rich environments, especially potted plants, greenhouses, and decaying vegetation. They are attracted to moisture and decomposing matter.

Diet & Feeding

Adult fungus gnats do not feed significantly. Larvae feed on fungi, decaying organic matter, and plant roots, especially fine root hairs.

Behavior Patterns

Adults are weak fliers and often seen walking or flying near the soil surface of potted plants. Larvae live in the soil. Their life cycle from egg to adult is typically 3-4 weeks. Females lay eggs in moist soil.

Risks & Benefits

Risks: Larvae can damage plant roots, especially seedlings and young plants, leading to wilting and poor growth. Large infestations can be a significant pest in greenhouses and homes with many houseplants. They are generally not harmful to humans. Benefits: In nature, they contribute to decomposition of organic matter, but in cultivated settings, their negative impact on plants outweighs any minor benefit.

Identified on: 10/7/2025