Pesky armyworms like to feed on grass. If you have them in your yard, you can use insecticides to get rid of them and/or keep your lawn well-maintained.
Pesky Armyworms Are Attacking Kansas Yards & Gardens. Here's What You Can Do

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Pesky armyworms like to feed on grass. If you have them in your yard, you can use insecticides to get rid of them and/or keep your lawn well-maintained.