Identification

Fungus gnats vs fruit flies: how to tell the difference

Written by Mustafa Ayan Fact-checked against university extension/IPM sources Last reviewed: October 14, 2026

Direct answer

Fungus gnats are dark with long legs and hover over houseplant soil. Fruit flies are tan with red eyes and gather around produce or drains. Drain flies are fuzzy and moth-shaped, resting near drains. Springtails are wingless and jump. Where you find them is usually the fastest way to tell them apart.

Pest	Appearance	Behavior	Breeds in
Fungus gnats	Slender, dark gray to black, mosquito-like silhouette with long legs and a single pair of clear wings.	Weak, wandering fliers. Rest on soil, pot rims, or nearby walls; lift off when a pot is watered.	Usually moist potting soil; can also occur in other damp organic sites
Fruit flies	Small, tan to brown, with a rounder body and noticeably red eyes.	Strong, darting fliers. Found around ripening produce or anywhere fermenting residue collects.	Commonly fruit, trash, and fermenting organic material
Drain flies (moth flies)	Small and fuzzy with broad, moth-like wings held in a tent shape at rest.	Weak, short hopping flights. Rest on walls and fixtures near sinks, showers, or floor drains.	Commonly drains and organic buildup in drain traps
Springtails	Tiny (under 1/8 in), wingless, gray to white. Not a fly at all — a distinct group of soil arthropods.	Don't fly. Jump or spring when disturbed. Often seen clustered on very wet soil surfaces or floating in a saucer.	Overly wet, organic-rich soil or decaying plant matter

Why the distinction matters

Fungus gnat treatments target moist soil and larvae underground — they won't touch a fruit fly problem coming from a bowl on the counter, and vice versa. Treating the wrong pest is one of the most common reasons a "fix" appears not to work. If you're still unsure, use the interactive identifier, which walks through the same distinctions with your specific situation.

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