|Best way to treat this would be ?|
|There are two approaches you can take to control Take All Root Rot. The fungicide Banner Maxx will control it, or you can topdress with a 1/2-inch layer of brown Canadian peat moss. Break the peat into small pieces and distribute it evenly over the grass. It is best if you mow the yard first.
Water thoroughly after the peat is spread to settle it to the soil surface. That acidic layer, in contact with the runners, retards development of the fungus and allows the grass to regrow strongly.
You'll need one 3.8 cu ft bale of peat moss per 1000 sq ft.
Best wishes with your lawn.