The trail you can see is a small fraction of the colony — which is why sprays give only temporary relief.
Foraging workers lay a chemical trail back to the nest for others to follow, which is why lines form along the same edges each day. The nest itself is often outside the building, in soil, wall cavities or under paving.
Mostly contamination of food and food-preparation surfaces rather than direct harm. Some species also nest in wall cavities and around electrical fittings, and large colonies are persistent once established.
Species identification, then transfer baits that workers carry into the nest to reach the queen, alongside perimeter and entry-point treatment. Killing the visible trail without the nest simply resets the problem.
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