Managing Armyworms in Your Lawn: Identification and Control

Understanding Armyworms

Armyworms are caterpillars that feed primarily on grasses, making them a common pest in pastures and lawns each year. The moths that lay the eggs cannot overwinter in northern Georgia; instead, they are carried northward each spring by storms and windy days. Their eggs hatch into the black caterpillars you see devouring your Bermuda grass.

Effective Control Strategies

Liquid insecticides—not granular formulations—are the recommended treatment for armyworms. Sevin 50% wettable powder can be mixed with water and applied as a coarse spray over the grass. For best results, wet the grass thoroughly and avoid mowing for three days after application.

Good News for Your Lawn

Armyworms rarely cause permanent damage to established lawns. Only occasionally do populations build up enough to warrant serious concern. With prompt treatment, your Bermuda grass will recover quickly.