Bag of Heritage G Fungicide. Probably cost you about $60 for 30lb bag. Rate is like 2lb/1000. Way more than you need for such a small area. Or you could go to Homestore and get something labeled for Large/Brown Patch.( Rizoctonia) Bayer usually has something on the shelf. Will involve mixing in a hand sprayer for the homestore method.
"The Poor Fish" circa 1930's: The Poor Fish wouldn't have been caught if he'd known enough to keep his fool mouth shut.
"Opportunity is missed by most because it is dressed in overalls and looks like work"- Thomas Edison, businessman/inventor