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How to Manage Pests

The UC Guide to Healthy Lawns

Lawn moths and sod webworms — Life cycle

Adults drop their eggs on turf leaves at night. Larvae emerge within a few days to a week. During the day they hide in silk-lined burrows, coming out at night to feed on leaves. First instar webworms skeletonize leaves while later instars notch or cut off leaf blades and pull them into the burrow. Sod webworms pupate in the soil/thatch layer. Adults emerge in the spring and are active through fall. There may be up to 4 generations a year in warm areas.
Lawn moth larvae

Statewide IPM Program, Agriculture and Natural Resources, University of California
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