Why do tiny ants keep coming back to your kitchen?

Tiny ants in kitchen Singapore: why they return

The line of ants on your counter or around the sink in an HDB flat or condo is only a small part of the colony. These are foragers, the workers that go out to find food and bring it back. The nest stays out of sight, often in a wall gap or under a cabinet, with many more ants inside than you ever see.

The University of Minnesota Extension explains that killing foraging workers has little effect, because only a small share of ants are out of the nest at any time. To eliminate a colony, the queens must be killed. While the queens survive, the colony survives, and new foragers soon find the same crumbs.

That is why the ants keep coming back after you spray or wipe them. You removed the workers you could see, not the colony behind them. Lasting control works on three fronts together: take away the food that draws them in, use bait that workers carry back to the nest, and close the gaps they use to get inside. The sections below cover each one.

Cut off food and water

Foragers keep visiting while there is something to collect, so the first job is to leave them nothing. The University of Minnesota Extension points to two basics: store foods in insect-proof containers and clean kitchen surfaces regularly.

Insect-proof means a lid that seals, not a folded bag or a rubber band. Start with sugar, honey, biscuits, cereal and bread, and move opened packets into jars or boxes with a tight lid. Wipe the counter after cooking, including the area around the rice cooker and kettle, where crumbs and drips build up.

Pet food is easy to miss. Do not leave the bowl out longer than your pet needs it, and keep the bag sealed. At the sink, clear food scraps after each meal, empty the sink strainer and do not leave dirty plates overnight. Take the kitchen bin out often and keep its lid closed. Before bed, wipe the sink and draining rack dry, and do not leave wet sponges or cups of water sitting out.

For a thorough clean, work through the kitchen deep clean checklist, paying extra attention to the places crumbs collect, such as under the hob, behind appliances and along drawer runners.

Use bait, not spray

Bait is the part of the plan that reaches the nest. According to the University of Minnesota Extension, workers carry bait back to the nest. Baits act slowly, and the Extension says they may take several weeks to several months.

Spray works the other way. It kills the foragers you can see, which, as explained above, does little to the colony. The University of Minnesota Extension also says not to spray an insecticide when using a bait. A sprayed trail kills the very workers you need to carry the bait home.

To give bait a fair chance, place it right beside the trail, close to where the ants are feeding, rather than in an open spot they never cross. Read the pack and follow its directions on where to put it and when to replace it. Then be patient. Check that the bait has not run out, and do not spray the ants that gather at it. Keep up the food storage and cleaning habits above while you wait.

Wipe trails and seal gaps

Wiping an ant trail with mild vinegar and water disrupts it, but only temporarily, according to the University of Minnesota Extension. Treat it as a way to clean up, not as the fix. The same page also lists sealing the cracks that ants use to enter.

To find the gaps, watch where the trail goes when the ants are active and note where it disappears. Check along the backsplash, where the counter meets the wall, around pipes under the sink and around window frames. Fill small cracks with a sealant suited to the surface. For gaps at a window, see the guide on a worn window rubber seal.

When to call a pest control company

Home treatment does not suit every ant. For Pharaoh ants, the University of Minnesota Extension says baits sold to residents are generally not effective, and professionals have access to effective baits.

It is reasonable to call a professional when you have baited patiently and the trail is still there, when ants appear in several rooms, or when you cannot tell what kind of ant you have or where they are getting in.

Before you book, note where the ants appear, what you have already tried and where you placed bait, and share this with the company. It gives them a clearer picture before the first visit. Our pest control questions page answers common questions to read before a treatment.

Choosing a company

Price depends on the job, so ask each company for a written quote that says what the treatment includes. Ask which ant it thinks you have, whether it will use bait, spray or both, how many visits are included and whether a follow-up visit is part of the quote. Ask what you need to do before and after each visit, such as clearing counters or keeping pets away. Our guide on how to hire a pest control company covers more checks to make before you book. For printed one-off ant rates, see the pest control cost guide.

Questions