Fungus Gnat

Natural Habitat

Damp, organic-rich environments, especially potted plants, decaying leaves, compost, and moist soil. Found indoors and outdoors.

Diet & Feeding

Larvae feed on fungi, decaying organic matter, and plant roots (especially tender root hairs of seedlings). Adults do not feed significantly and primarily live to reproduce.

Behavior Patterns

Adults are weak, erratic fliers often seen near potted plants or windows. Larvae live in the top layers of moist soil. They are attracted to light and moisture. Their life cycle is relatively short, typically 3-4 weeks from egg to adult.

Risks & Benefits

Potential risks include damage to plant roots (especially seedlings and young plants, leading to wilting, stunting, or death) due to larval feeding. They are also a nuisance pest indoors. Generally, they pose no direct risk to humans or animals. In nature, they play a role in decomposition and nutrient cycling by breaking down organic matter.

Identified on: 10/1/2025