Why You Have Fruit Flies

Fruit flies breed in fermenting organic matter — overripe fruit, vegetable scraps, damp bin liners, dirty drains and even residue in empty wine or juice bottles. A single female lays up to 500 eggs in her short lifetime. Killing adult flies helps but eliminating the breeding source is the only permanent solution.

Step 1: Remove the Breeding Source

  1. 1

    Remove all overripe fruit

    Bag and bin any fruit that is very ripe or starting to ferment. Even a single piece of overripe fruit on the counter supports a large population.

  2. 2

    Empty and clean the bin

    Empty the kitchen bin, clean it with hot soapy water and dry completely. The residue and moisture in a bin liner is a prime breeding site.

  3. 3

    Clean the kitchen drain

    Pour boiling water down the sink drain, followed by a mix of baking soda and white vinegar. Let it fizz, then flush with more hot water. Fruit flies frequently breed in the organic buildup inside drains.

  4. 4

    Check empty bottles and damp areas

    Rinse empty wine, juice and sauce bottles immediately before recycling. Wipe down damp areas near the sink. Check under the fridge for any spilled liquid.

Step 2: Set a Trap for the Adults

  1. 5

    Apple cider vinegar trap

    Pour about 2–3cm of apple cider vinegar into a glass or jar. Add one drop of dish soap (breaks the surface tension so flies sink). Cover tightly with cling wrap and poke 8–10 small holes with a toothpick. Place near where flies are congregating. Flies enter through the holes, cannot escape and drown. Empty and refresh every 1–2 days.

  2. 6

    Red wine trap

    Leave a nearly empty bottle of red wine with a small amount remaining. Flies are attracted to the fermentation and get trapped in the bottle. Effective and requires no setup.

How long does it take?With the breeding source removed and traps in place, most infestations are under control within 3–5 days. If flies persist after a week, there is still a breeding source you have not found — check the drain more thoroughly or look for forgotten produce.

How to Prevent Fruit Flies

  • Store ripe fruit in the fridge rather than on the counter
  • Empty the kitchen bin every 2–3 days in summer
  • Rinse all recycling before putting it in the bin
  • Keep the kitchen drain clean with a weekly hot water flush

Frequently Asked Questions

Fruit flies (small, red-eyed, hover around fruit and bins) breed in fermenting organic matter. Fungus gnats (darker, longer body, hover around houseplants) breed in moist soil. The traps are similar but fungus gnats require treating the soil of houseplants — let it dry out between waterings and use yellow sticky traps.
No — fruit flies do not bite humans. They are purely an annoyance and a hygiene concern (they can spread bacteria from rotting food to food preparation surfaces), not a health risk through biting.