Waitea patch appearing on golf courses

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

A relatively new turfgrass disease called Waitea patch (Waitea circinata) has been making appearances in Poa annua putting greens in Michigan. Waitea patch has also been referred to as brown ring patch in Japan, but until the causal organism is confirmed to be the same in the United States, the Waitea moniker seems to be the name of choice. Waitea patch is a Rhizoctonia disease. The symptoms of Waitea patch involve Poa annua turning yellow in a ring and looking very similar to yellow patch. (view image)The warm weather in the last several days is favorable to development of Waitea patch, but would not be conducive to yellow patch, which is usually seen during cooler weather. Dr. Frank Wong at the University of California – Riverside in cooperation with the Pace Turfgrass Research Institute, has research results in controlling Waitea patch posted at 6-1OSUcontrol.pdf

Waitea patch appears to be a moving target when it comes to fungicide efficacy. Dr. Vargas at MSU has advised me that he has seen control with Heritage, Prostar, Insignia, Compass and Disarm. Some superintendents are also reporting success with Banner, Medallion and Endorse. Please refer to the label for recommended rates and application procedures.

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