Sod webworms are the larvae of “lawn moths” that eat grass blades at night and live in silk-lined tubes or “webs” in the thatch and soil layers. The first generation of sod webworm generally emerges in mid-May to early June. The grass is healthy and growing fast at that time, allowing it to grow out of the sod webworm damage. So, we tend not to notice the damage. Most of the damage from sod webworms comes from the second generation that will occur in August. Watch the video below to learn how to control the second generation of sod webworms.