The foragers will eat the bait and return to the nest, where they will lay edible eggs that will feed the colony. The bait should be slow-acting to ensure that it is still effective once it gets to trophic egg stage. Spray treatment is not recommended because it can separate the main colony into many subcolonies, causing the problem to become worse. It was probably introduced in New Orleans, La., via coffee shops, before 1900. This species is mostly found in Southern states, and usually nests near moisture sources such as water pipes, sinks and potted plants.
Argentine ants follow regular trails when foraging.
They invade buildings when outside conditions are too dry or too wet. Locating the nest and treating with a residual insecticide is the ideal treatment. I would try following the ants back to their food source, then bait and use boric acid. Outside, perimeter barrier treatments are a must, and should be maintained. However, baiting is preferred, as these ants tend to move if treated with a spray.