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Webworms are easiest to kill them when they are small, soon after they hatch. When you see the adults flying over the lawn, they are dropping eggs onto the lawn. Peak egg laying times are in June and August. The time to spray is about 2-3 weeks after you see the adult moths flying over the lawn. That's when the larvae are just hatching and most vulnerable to insecticides. It's a good idea to mow and water the lawn the day before you treat it and when you spray, spray as late in the day as possible because the webworms leave their burrows and become active and feed in the evening.
Bonide Captain Jacks Deadbug Brew Ready-to-Spray (hose-end sprayer) or Bonide Eight Yard & Garden Ready-to-Spray are both listed for control of sod webworms. Be sure to read and follow the label directions.