A heavy infestation can destroy a lawn in only a few days. Insecticide application should be timed for treatment two weeks after peak moth activity and should be made during early evening hours when caterpillars begin feeding on the surface of the turf. Their bodies are greenish when small but become brown when fully grown. Several stripes are usually apparent, extending from the head to the rear. Moths lay clusters of eggs on grass blades, lawn furniture, white or light colored walls and other objects near lawns.
Caterpillars hatch and begin to feed on the turf.
Damaged turf appears ragged with individual blades showing signs of chewing damage. When numerous, they may devour the grass down to the ground. Caterpillars pupate in the soil. The moths emerge within a couple of weeks. They are active mainly at night.