Armyworms and cutworms are caterpillars that feed on grass blades in this layer. Billbugs are weevils with characteristic long snouts. They live in silken tubes attached to the base of the plants. The first sign of webworm damage is areas of unevenly cropped gras. Large areas may turn brown and die.
Sod webworms produce two to three generations each year.
For this reason, damage is likely to increase in late summer. They have a noticeable snout projecting in front of the head, and they fold their wings tightly against the body when resting. They hide in the shrubbery or other sheltered spots during the day. In early evening, fly above the grass. Females scatter eggs over the lawn as they fly.