Best Bait for Fly Traps in New Zealand

The secret to an effective fly trap is simple: match the bait to the fly. House flies, blowflies and fruit flies are drawn to completely different things, and using the wrong bait is the most common reason a trap sits empty. Here is what works in New Zealand, using everyday pantry ingredients — no chemicals, no sprays, nothing toxic near your food.

For house flies: sugar-water or yeast

House flies are drawn to sweet, fermenting smells. The simplest effective bait is a sugar-water mix — about 1 part sugar to 4 parts water, dissolved and poured into the trap. Add a pinch of yeast and the fermentation smell makes it even more attractive. A little beer or leftover wine also works — the alcohol and fermentation draw them in.

Fill the trap about a quarter to a third full, and top up every week or two in hot weather. Place it just outside the kitchen door, upwind, near the bin and compost — see our reusable fly traps for the right trap for this bait.

For blowflies: raw meat or fish

Blowflies are larger, metallic-looking flies drawn to protein — meat, fish and animal waste. A small piece of raw meat, fish or chicken skin in the trap is extremely effective. In hot weather, change it every few days before it smells — a scrap the size of a 50-cent piece is plenty.

Blowflies are the ones that cluster around dead animals and bins, and they are a genuine food-safety risk because they walk between waste and your food. A trap with meat bait placed near the bin or compost intercepts them before they reach the kitchen.

For fruit flies: apple cider vinegar

Fruit flies (vinegar flies) are tiny, red-eyed, and drawn to the smell of fermentation — ripe fruit, juice, wine and vinegar. The gold-standard bait is apple cider vinegar with a drop of dish soap. The vinegar draws them in, and the soap breaks the surface tension so they sink instead of floating. Pour about 2 cm into a small fruit fly trap and place it next to the fruit bowl.

Red wine, overripe banana, or a mix of water and yeast also work for fruit flies. The key is that the bait smells of fermentation — that is what the flies are looking for.

What NOT to use

• Honey: it attracts bees and other pollinators — do not use it in a fly trap.
• Chemical insecticides: unnecessary and they contaminate the trap. Pantry bait works better and is safe around food.
• Oily or greasy foods: they coat the trap and stop it working.
• Plain water: not attractive enough on its own — you need sugar, protein or fermentation.

Tips for better catches

• Place the trap upwind of the area you want to protect — the scent carries on the breeze and draws flies toward the trap, not your food.
• Keep the trap clean — rinse it with warm water when you refresh the bait. A clean trap catches more effectively.
• Start early in the season — have traps out by October in most of NZ, before fly populations peak in midsummer.
• Use the right trap for the right fly — a large outdoor fly trap for house and blow flies, a small indoor fruit fly trap for vinegar flies. See our kitchen fly trap guide for the full comparison.

The right bait, in the right trap, in the right place — that is the whole formula. It costs nothing to run because the bait comes from your pantry, and it is completely chemical-free. For the full approach to fly control, see our how to get rid of flies guide. To see fly activity in your neighbourhood, check the Pest Tracker.