Gnats
Gnats is a common term encompassing several species of small flies that swarm near faces, breed in houseplant soil, and congregate around lights. Fungus gnats breed in the moist, organic-rich soil of potted plants and are the most common gnat complaint in homes and offices. Eye gnats are outdoor pests attracted to eyes, nose, and wound secretions. Buffalo gnats (black flies) breed in flowing water and deliver painful, bleeding bites. Understanding which gnat species is involved is essential because each has different breeding sources and management requirements.
Species in This Group (2)
Key Behaviors
Fungus gnats lay eggs in moist potting soil where larvae feed on fungi, organic debris, and plant roots. Adults are weak fliers that hover near plants and windows. Eye gnats are persistent outdoor pests that swarm around faces in warm weather. Buffalo gnats emerge from rivers and streams in massive numbers in spring and can bite aggressively. All gnats are attracted to light and moisture.
Risks & Concerns
Fungus gnat larvae can damage plant roots, particularly in seedlings and young transplants. Buffalo gnats deliver painful bites that bleed freely and can cause severe reactions in livestock and occasionally humans. Eye gnats can mechanically transmit conjunctivitis. In homes, fungus gnats are primarily a nuisance associated with overwatered houseplants. In greenhouse operations, they can cause significant crop damage.
Quick Comparison
| Species | Size | Color | Key Trait |
|---|---|---|---|
| Fungus Gnat | 2-5 mm | Dark gray to black with long legs and clear wings | Tiny, delicate dark flies that hover around potted plants; larvae feed on fungi and plant roots in moist soil. |
| Buffalo Gnat | 2-5 mm | Black to gray with a distinctive humpbacked thorax | Humpbacked profile; breeds in flowing water; bites cause significant skin reactions; swarms in spring near rivers. |
Need Help With Gnats?
If you're seeing signs of gnats in or around your home, professional treatment is the fastest way to stop the problem. Lotus Pest Control offers free inspections to identify the issue and recommend the right solution.