Golf Course Management

MAR 2014

Golf Course Management magazine is dedicated to advancing the golf course superintendent profession and helping GCSAA members achieve career success.

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86 GOLF COURSE MANAGEMENT 03.14 Reducing brown ring patch severity on Poa annua greens Brown ring patch is similar to other Rhizoctonia diseases, but does not react the same way to fungicides. We have conducted joint research stud- ies on the management of brown ring patch since 2010. From a feld research perspective, this disease has been challenging to work with because it is diffcult to fnd naturally infected putting greens with uniform dis - ease incidence and severity. The main body of research presented in this paper comes from work conducted in 2010 and 2011 on a putting green in New Jersey that exhibited an unusually uniform distribution of brown ring patch symptoms. Additional data were obtained in 2012 and 2013 from smaller re - search trials on putting greens in Pennsylva- nia with less severe disease pressure. Brown ring patch has become an important dis - ease of annual bluegrass (Poa annua) put- ting greens in the Northeastern region of the United States since 2007 (6). The disease Brown ring patch is caused by Waitea circinata var. circinata (sometimes referred to by its asexual stage R izoctonia circinata var. circinata) and is a serious disease of short-mowed annual bluegrass turf through - out much of the cool, humid regions of the United States. In New Jersey and much of the mid-Atlantic and Northeast regions, this disease is often observed from early spring — when annual bluegrass is breaking dor - mancy — through late spring. However, in cooler regions, it can be a problem during the summer when air temperatures range from 65 F to 95 F (18 C to 35 C). Although the same pathogen can also signifcantly damage roughstalk bluegrass (P. trivialis) and creep - ing bentgrass (Agrostis stolonifera) (4,6), our Steven J. McDonald, M.S. Richard Grala Bruce B. Clarke, Ph.D. Symptoms of brown ring patch start as small yellow rings with green grass in the center and can ultimately reach a few feet in diameter. The yellow rings can turn an orange or brown color as the disease progresses, and the pathogen may eventually kill affected turf. Photos by Steve McDonald 078-095_March14_TechwellCuttingEdge.indd 86 2/18/14 1:46 PM

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