This is when you need to dethatch Bermuda
There have been discussions here one why dead brown grass won't go away. So I thought during my dethatch I would take a few photos to show even a well cared for lawn needs to be dethatched. If you notice the brown blades mixed in with the green then you know there isn't much you can do but dethatch.
The Bermuda is Yukon Sahara and Tiffway 419 mowed at 1" I use a Bluebird dethatcher rake and lightly overseed bare areas and fertilize.