This disease affects primarily St. Augustinegrass, but also centipedegrass. It is most often observed from late spring to early fall, especially during prolonged periods of rainfall. This revised 2-page fact sheet was written by M. L. Elliott and P. F. Harmon, and published by the UF Department of Plant Pathology, February 2011.
http://edis.ifas.ufl.edu/lh047