Fungus Gnat

Natural Habitat

Damp, organic-rich environments, often associated with potted plants, decaying leaves, and moist soil. Indoors, they are commonly found near houseplants.

Diet & Feeding

Adult fungus gnats typically do not feed on solid food and have short lifespans, focusing on reproduction. Larvae feed on fungi, decaying organic matter, and plant roots, especially fine root hairs of seedlings.

Behavior Patterns

Adults are weak fliers and are often seen flying in erratic patterns near potted plants or windows. Females lay eggs in moist soil. Larvae develop in the soil, and their presence can indicate overwatering of plants. The life cycle from egg to adult is usually 3-4 weeks depending on temperature and humidity.

Risks & Benefits

Risks: Larvae can damage plant roots, especially in germinating seeds and young seedlings, leading to stunted growth or death of the plant. They are generally considered a nuisance pest indoors. They do not bite humans or transmit diseases. Benefits: In natural ecosystems, they contribute to decomposition processes by breaking down organic matter and fungi.

Identified on: 10/30/2025