Southern blight or as it sometimes is called Rolf’s disease is a summertime disease that occurs under warm to hot temperatures (85 to 95 F). Combined with high moisture the disease can cause devastating injury to the turf. Symptoms appear as large crescent to circular rings that can reach in several feet in diameter. The symptoms initially appear a reddish brown color that turn to gray. Symptoms on Kentucky bluegrass might be confused with necrotic ring spot but southern blight occurs under much hotter and moist conditions. Sometimes the turf will remain green (frog-eye) in the center of the damaged area.
For those who wish to continue the pursuit of lifelong learning in the area of turfgrass management we offer three courses or seminars in English, two in Portuguese and one in Spanish through The Ohio State University. A list of the courses can be found on GlobalTurf Network under education, or directly at iTunes U Course Offerings. We have also provided a brief video below how to find the courses through iTunes U.