One of the reasons why your lawn is having infestations is the Tropical Sod Webworm. It's not a worm but it's a moth that lays their eggs on the grass. But the deal is these moths doesn't do the damage but their eggs do. One of a few quick solutions is by regularly watering and mowing your lawns and if other methods don't work, then you can proceed to using pesticides.

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Source: Gardening Know How