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Are fungus gnats the same as the fruit flies in my kitchen?

No. Fruit flies go for ripe fruit and have red eyes; fungus gnats are darker, thinner, and hang around houseplant soil. The control methods are different too.

Will fungus gnat larvae actually damage my houseplants?

Adults don't, but the larvae chew roots. Mature plants usually cope, but seedlings, cuttings, and already-stressed plants can be badly set back.

Why do I only get fungus gnats in certain pots?

They lay eggs in damp, peaty potting mix. The pots that stay wet longest — usually the over-watered ones or those without drainage — are where they breed. Letting the surface dry between waterings is the single biggest fix.

Will a GotchaPest fruit fly trap catch fungus gnats too?

Yes — a shallow trap with apple cider vinegar bait catches the flying adults while you dry out the soil. It won't touch the larvae in the mix, so pair it with less watering and yellow sticky traps for full control.

Fungus Gnats

Tiny black flies around your houseplants — beat them for good.

NZ Pest Guide

Fungus gnats are the little black "fruit-fly look-alikes" that hover around your indoor plants. The adults are mostly a nuisance, but their larvae live in the potting mix and chew plant roots — which can stunt seedlings and weaken houseplants.

They thrive in damp, peaty mix, so the fix is watering less and trapping the flying adults before they lay more eggs.

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The GotchaPest trap for this pest

Indoor Reusable Fruit Fly Trap

NZ-made, chemical-free indoor fruit fly catcher using everyday household bait.

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How to identify fungus gnats

Smaller and darker than a fruit fly, with long legs and a mosquito-like darting flight close to the soil surface.

•Tiny dark flies, 2–4 mm, hovering over potting mix.
•Larvae are translucent white threads with black heads in the soil.
•Plants may show yellowing leaves or stunted growth.

Are fungus gnats harmful?

Adults don't bite or spread disease. The larvae feed on roots and can seriously damage seedlings, cuttings, and stressed plants — mature plants usually tolerate them.

Life cycle

Females lay eggs in damp soil; larvae feed on fungi and roots for about two weeks, then pupate and emerge as adults. The cycle runs 3–4 weeks, and several generations overlap indoors all year.

Fun fact: Adult fungus gnats live only about a week — but a single female can lay 200+ eggs in that time.

What they feed on

Larvae eat fungi and decaying organic matter in wet soil, plus tender roots. Adults barely feed — they exist to mate and lay eggs.

How to get rid of fungus gnats

Dry out the breeding ground and trap the flyers.

Remove the attraction

✓Let the top few centimetres of potting mix dry between waterings.
✓Remove dead leaves and debris from the soil surface.
✓Avoid over-watering — use pots with good drainage.
✓Repot in fresh, well-draining mix if the old mix stays soggy.

Block them out

✓Yellow sticky traps near plants catch the adults.
✓Bottom-water plants so the surface stays drier.
✓Quarantine new plants for a couple of weeks.
✓A shallow GotchaPest fruit-fly trap with cider vinegar bait catches stray adults.