Can someone help identify what this is?
Oogway said:
I'm no expert but it looks like TARR- take all root rot. I believe the treatment for that is peat moss top dressing. I will edit my reply after I check my book.
Edit- if it is TARR, then they prefer brown Canadian peat moss (something to do with the acid?) and the amount (approximately 1 bale per 1000 sq ft of turf) is listed at the bottom of the page in this link:
http://www.plantanswers.com/root_rot_fungus.htm