The lawn moths live only a few days and are not able to feed. You can conduct a simple test to determine whether webworms, cutworms, or armyworms are injuring your lawn. Apply the entire mixture to 1 square yard of lawn containing both damaged and undamaged turf. Use a sprayer or sprinkling can and apply as evenly as possible. Webworms, cutworms or armyworms will come to the surface within 10 minutes.
Diagnostic kits are available for commercial operations.
If the infestation is severe enough to warrant control, treat with an insecticide. Apply according to directions and precautions provided by the manufacturer. For best results, water the lawn before application, apply materials in the evening, and do not water or mow for three days. Contact your local lawn and garden dealer or local Extension office for current chemical recommendations. Edited in June 1997, based on material developed in 1986.