Inspecting for Argentine Ants
In the Spring, the nest can be found in open ground with small piles of excavated earth a short distance from the nest holes. Form boards along sidewalks, patios, driveways, and wooden objects of any kind are preferred as nesting sites and runways. The area beneath a plant infested with "ant cows" often will be honey-combed with their tunnels. The ants may be encountered in great numbers in and under dead and decaying stumps.
During warm weather, the Argentines might favor the undersides of houses and may use the mudsills as their runways, even establishing themselves in the home itself. During the Summer months, the nests of this ant are very shallow, usually only one or two inches below the surface of the soil. An occasional exception can be found in the roots of large trees located in favorable areas to the Argentine ant.
Argentine ants begin to migrate and congregate into super "ant cities" during Autumn, where you can find hundreds of queens. To locate these colonies, inspect beneath any ground "clutter" such as piles of construction materials, boards, sheets of tin or plywood and even decaying plant material. It is in these warm, protected areas that the Argentine Ant will retreat from the ravages of Winter.