They are nocturnal and hide in the day but may become active on cloudy days. Generally, adult moths begin to appear in March and may produce four generations per year. Sod webworms cut off blades of grass above the thatch line and pull them into their tunnels and eat them. Closely cropped grass may appear as small brown patches. If infestation is heavy, patches may run together to form irregular brown patches.
Adult moths are weak flyers and live only a few days.
There may be two or three generations per year. Do not irrigate treated area following insecticide application. Use 6 qt Sevin SL per acre for sod webworm control. Controls only cutworms and sod webworms. A single repeat application can be made if needed.