Why do ants keep coming back after I wipe them?
Wiping removes the workers and part of the scent trail, but the colony that sends them is still there. Scouts rebuild the trail within hours. Control depends on reaching the colony, usually through bait carried back to the nest, and on closing the way in.
A trail is a road, not an event. As long as the road leads to food or water and the nest is healthy, ants keep using it.
Cleaning up the food or moisture they are after helps, but it rarely ends the problem alone. A technician who traces the entry and treats the source is solving a different problem from a cloth.
Should I spray the ants I see?
Usually not. A contact spray kills the ants it touches and can leave a residue that bait-eating ants avoid, so the colony reroutes or splits. Bait works because ants take it home. Spraying across a bait trail can undo it.
If you want to do something before the visit, put away open food, wipe up spills and fix a dripping tap. Leave the line alone if you can, because the technician can read it.
Take a photograph of the ants and note where they enter. A close-up with a coin beside them helps with identification.
Do ants mean my house is dirty?
No. Ants follow food, water and shelter, and they can be drawn by a dripping pipe, a crumb behind an appliance or a sweet spill on a shelf. Even a clean kitchen can have a trail when a colony nearby finds a way in.
The cause is usually where the ants come from, not what you did. The technician asks questions about water, food storage and recent changes such as new plants, a leak or a nearby building project.
That said, good habits reduce the pull: sealed containers, pet bowls picked up at night and fruit not left in the open.
When are ants a sign of a wood problem?
Some ants nest in damp or decayed wood, and a trail from a damaged board can point to a moisture problem as well as ants. If you find sawdust-like debris beneath a wooden surface, tell the technician so the wood can be examined.
Wood damage may also be from termites or fungus. Our dry rot and wood damage page explains how those are told apart, and termite inspection covers reports.
For a species that forms very large colonies and trails, see our page on Argentine ant control.
