Answer: Soil nesting ants construct mounds or small hills by bringing granulated soil to the surface from the nest below. Mounds may be unsightly, may cause lawn unevenness, and if large, may smother out the surrounding grass. Ant mound building is highly variable from year to year and from place to place.
Eliminating some of the worst ant hill activity may be possible by raking flat, on a regular and frequent basis, ant hills that appear above the grass tops during periods of prolific ant nesting activity (such as during periods of wet spring weather). For the worst cases it is possible to spot treat ant hills with insecticide. General lawn treatment specifically for ant colonies is seldom necessary.
Rake the ant hill flat and sprinkle ant control granules onto the soil surface. Or simply pour boiling water on the mound to kill the ants. If granules are used, rake the area lightly after application and sprinkle with water. Keep children and pets away from the treated area until the grass has dried.
Bare spots can be raked and overseeded now, in the spring.
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