Sod webworm moths don't feed on lawn grasses, but they drop their eggs into the grass as they fly. After 6 to 10 days, the eggs develop into very hungry caterpillars. These immediately begin feeding on grass blades, and are active only at night. As they feed, they build silk-lined tunnels in the thatch near the soil surface. During the 35 days or so that the webworm lives as a caterpillar, it can eat about 4 square feet of grass.
In the warmer areas of the country, webworms may produce up to 3 generations, during May, July, and September. In Western and Southern states, webworm generations may overlap, with all life stages--eggs, caterpillars and moths present in the lawn at the same time.
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