Controlling Ant Nests in Lawns: Identification, Treatment, and Prevention

Controlling Ant Nests in Lawns: Identification, Treatment, and Prevention

The common lawn ant nests in well-drained clay or gravelly soil, creating small mounds with a central entrance. Workers are ~¼ inch, yellowish.

Treatment Steps

1. Locate the nest (mound with central hole).
2. Apply insecticide directly into the mound and a few feet around it. Effective active ingredients: diazinon, baygon, carbaryl (Sevin), bendiocarb (Ficam). Follow label directions; repeat if needed.
3. For house invasion: Perimeter spray—treat foundation up to 2 ft high and 3 ft out into soil, especially around windows/doors. Use wettable powder formulation to avoid plant injury.

Cultural Prevention

• Mow at 2.5–3 inches.
• Mow frequently, removing no more than 1/3 of blade.
• Dense turf discourages ant nesting.

Professional Help

For large or persistent infestations, a licensed pest control firm is recommended.