Fungus Gnat Larva / Drainage Fly Larva (based on appearance as a small worm-like creature)

Natural Habitat

Fungus gnat larvae are typically found in moist soil rich in organic matter, often in potted plants indoors or in damp outdoor environments. Drainage fly larvae are found in decaying organic matter and sludge in drains, sewers, and other damp, stagnant water areas.

Diet & Feeding

Fungus gnat larvae feed on fungi, organic decaying matter, and sometimes plant roots. Drainage fly larvae feed on decaying organic matter, bacteria, and algae in their damp environments.

Behavior Patterns

Larvae of both types of flies are most often found crawling on surfaces near their breeding sites. They remain largely hidden within their food source or in damp crevices. They are largely sedentary during their larval stage, focusing on feeding and growing before pupating.

Risks & Benefits

Fungus gnat larvae can damage plant roots, especially in seedlings and young plants, and are considered a nuisance pest indoors. Drainage fly larvae are generally not harmful to humans, but can indicate plumbing issues (clogs) and large infestations can be a nuisance.

Identified on: 9/22/2025