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Heavy foot traffic or dog waste may be the culprit. If armyworms are truly the cause, you'll be able to see the pests eating your grass.
What Causes It
Armyworm larvae Armyworm larvaechew grass blades down to the crown, especially during cool, wet weather.
Fast fix: Apply a solution of parasitic nematodes to the infested area; then water well. Bacillus thuringiensis (BT) is effective when the larvae are small.
Prevention: Rake out dead grass and reseed with endophyte-enhanced varieties.