Nontypical not sure where you are, but up here (alcorn county) they are pretty much gone.
Cb123 they are actually moth larva that come through and eat all grass/crops in their way. Unless they are real bad, they seem to focus on the ends of the grass.
https://en.m.wikipedia.org/wiki/Fall_armywormWhen I'm mowing an area with alot of them the concrete drives and walks gets covered.
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