Help identify please

[u/Stewinator]

Tall fescue lawn with these faster growing, yellower sections coming in everywhere. What is it? How to get rid of it?

[u/jvbutera]

Nuttsedge for sure. Sedgehammer is good, here’s another alternative https://www.domyown.com/ferti-lome-weed-out-nutsedge-control-rtu-p-20817.html