Research conducted at Washington State University's Western Research and Extension Center identified the cause of "necrotic ringspot" on bluegrass turf to be the fungus Leptosphaeria korrae. The authors discuss the signs and symptoms of the disease along with control methods.
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Spring 1985 Vol. 9, Issue 1 Pages 14-16
Ralph S. Byther Extension Plant Pathologist Gary A. Chastagner Plant Pathologist Washington State University, WWREC Puyallup, WA 98371