You reach for a banana, and a tiny cloud of flies lifts off the fruit bowl. Suddenly, making breakfast feels like interrupting a very unwelcome house party. Swatting at them might feel satisfying, but it does little to explain why they keep returning.
Before you buy specialized traps, check your pantry. Apple cider vinegar is a useful bait for catching adult fruit flies, and university extension experts include it in their homemade trap instructions. The catch? Trapping flies is only part of the solution. Removing what lets them breed matters just as much. entomology.mgcafe.uky.edu
Why Apple Cider Vinegar Works

Fruit flies have a weakness you can use against them: their attraction to fermenting food and liquids. University of Maryland Extension lists vinegar, wine, beer, fruit juice, and overripe produce among the things that draw them in.
That makes apple cider vinegar a practical lure. Instead of chasing individual flies around your kitchen, give them a specific place to gather and turn that destination into a trap.
Think of the vinegar as bait, rather than a kitchen-wide repellent. Leaving an open bottle nearby will not address the source of an infestation. The useful part is combining that attractive liquid with a container designed to capture visiting flies. www.extension.umd.edu
Make a Simple Jar Trap

University of Maryland Extension recommends a straightforward setup using apple cider vinegar, a drop of dish soap, a glass jar, plastic wrap, and a rubber band.
Pour some vinegar into the bottom of the jar and add one drop of dish soap. Stretch plastic wrap tightly across the opening, secure it with the rubber band, and poke a tiny hole so flies can enter.
You do not need an elaborate countertop contraption or a long shopping list. An ordinary jar gives you somewhere to start with supplies you may already own. www.extension.umd.edu
Related: 7 Proven Ways to Keep Your Kitchen Pest Free
Put the Trap Where Flies Gather
Placement deserves a little thought. University of Kentucky extension entomologist Michael F. Potter recommends positioning jar traps wherever you see fruit flies.
That might mean beside the fruit bowl or near another area where they repeatedly gather. Watch their activity instead of choosing a random corner simply because the jar looks tidier there.
Kentucky also describes another option: a jar containing a few ounces of cider vinegar with a paper funnel placed in its opening. Either way, the goal is to capture the adults already flying around. entomology.mgcafe.uky.edu
Find Their Hidden Breeding Spot

Here is where the kitchen detective work begins. A trap can collect flies while a forgotten food source keeps producing more.
University of Wisconsin Extension advises checking stored onions, potatoes, squash, and other produce that sits out of sight. Look beneath appliances for stray scraps, inspect the bottom of trash cans, and check recycling containers for residue.
The obvious banana on the counter may be innocent. The forgotten potato in the cupboard could be hosting the real party. Finding and removing breeding sites is essential to stopping the problem. Work through these places methodically instead of assuming an empty fruit bowl means you have checked everything. hort.extension.wisc.edu
Keep the Cleanup Going
Once you have removed spoiled produce, give the surrounding storage areas attention. Cornell’s Integrated Pest Management program recommends washing produce bins, emptying kitchen compost and garbage frequently, rinsing recyclables, and letting wet rags and mops dry fully.
Check homemade traps daily, too. Cornell advises replacing bait every few days so the trap doesn’t become a place where larvae develop.
Make those checks part of your usual kitchen reset: inspect the fruit, clear the scraps, and look at the trap. Apple cider vinegar can help catch the adults, but consistent cleanup removes the conditions that keep inviting another generation back. That is how you turn a useful pantry trick into a lasting household habit. cals.cornell.edu