I apologize, I think I have the pic showing now?

Also, I will get some better pictures in a few hours.

Is that an area where the water sits after a hard rain? It may be that poor drainage is causing so localized fungus issues. But would need better pictures so know for sure.

Whats that white powder on it?

I had not thought about water sitting there, but I think you may be on to something here. That is the lowest point of the yard, and that wall probably isn't allowing it to drain to the alley behind it. If this is in fact the case, and it is a fungal issue, how would I go about correcting the soil (after I fix the drainage issue)?

Adam, there isn't white powder on it, that is the dead stolons from the St Aug.

Since 2002 I've been using ordinary corn meal to solve my fungal diseases in St Aug. It works every time for me. Apply at 20 pounds per 1,000 square feet.

Drainage is an issue. When the soil sits underwater for days at a time it kills the aerobic microbes (the good guys). The remaining anerobic microbes seem to favor swamp grass type plants.