Fungus gnats

Adults are usually a nuisance around moist growing media. Larvae mainly eat fungi and organic matter, but large populations can damage roots, especially in seedlings and young plants.

Isolate nowPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.

Check one of my plants Browse another problem

Signs you may notice

small dark flies
flies near soil
persistently damp medium

Safe first checks

Confirm the insects emerge from the medium and review how long the pot remains wet.
Move the plant away from the collection.
Inspect both sides of leaves, stems, crevices, and the pot.
Photograph the signs before cleaning so you can compare changes.

Can look similar to

Overlapping symptoms are common. Compare these alternatives before choosing a treatment.

fruit flies
shore flies
whiteflies

What to avoid

Do not apply several pesticides at once or treat before confirming that a living pest is present.

Record and follow up

Reinspect the isolated plant and nearby plants every few days. Record living pests, new damage, and treatment response before deciding the problem is resolved.

Seek qualified local help when damage is severe, rapidly spreading, or may involve a regulated pest or disease.