If you suspect you may have sod webworms but aren't sure, you can test suspicious areas by soaking them in a soapy water solution.
Use about 2 tablespoons of dish detergent in 2 gallons of water. Apply to about a square foot of your turf. Let it soak in for a few minutes, and watch for worms to become visible at the top of the grass. If you see more than 10-15, it is a good idea to begin treating your lawn.
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