Yet another Rhizoctonia sighting this summer. This time on centipedegrass in Baton Rouge. To be more precise, from my front yard, and in an area that gets full sun! Received these photos from my wife bright and early the other morning when she got back from walking the dogs. At first, I thought it might be Pythium as you don’t usually see this much mycelium with brown patch. Also, I wasn’t sure whether it was on the centipede or the lespedeza that’s taken up residence in the lawn. I brought a sample into the lab today and quickly found that it was indeed Rhizoctonia, and that it was attacking both the centipede and the lespedeza! Neat! Guess it’s time to make a fungicide application though.
Donald M. Ferrin, Ph.D., Louisiana State University Agricultural Center, Baton Rouge, LA