Fungus Gnat

Natural Habitat

Damp, humid environments with decaying organic matter, such as potting soil, compost piles, greenhouses, and areas with water leaks or poor drainage. Commonly found indoors around houseplants.

Diet & Feeding

Adult fungus gnats typically do not feed or feed on liquids. Larvae feed on various decaying organic matter, especially fungi, algae, and plant roots (particularly seedlings and houseplants).

Behavior Patterns

Flies erratically, often attracted to lights at night. Females lay eggs on or near suitable decaying organic matter. Larvae develop in moist environments, feeding on fungi, bacteria, and decaying material. They have relatively short life cycles.

Risks & Benefits

Potential Risks: Primarily a nuisance pest indoors. Larvae can damage roots of seedlings and young plants, especially in commercial nurseries or heavily infested houseplants. They do not bite humans or transmit diseases. Potential Benefits: In outdoor ecosystems, some species may play a minor role in decomposition.

Identified on: 8/29/2025