Michigan State University Turfgrass Scienceturf.msu.edu

Microdochium Patch

May 10, 2012 at 1:13pm  —  Kevin Frank

The weather of the last week with temperatures in the 60's and plenty of precipitation have resulted in ideal conditions for the development of Microdochium patch. I would suggest you consider making a fungicide application to prevent the disease from occurring on your turf. This time of year when the disease occurs, new infections appear as small, copper-colored spots, usually 1 to 3 inches in diameter. You may also see it developing on the outer edges of old Microdochium patches still evident from the winter Infection. This disease is sometimes mistakenly referred to as copper spot, which is a disease of velvet bentgrass that occurs when the temperatures are in the 80's. Microdochium patch can also be spread by mowers which results in streaking much like what occurs with Pythium blight. The Qo I fungicides, iprodione, and vinclozolin are excellent fungicides for the control of this disease. Chlorothalonil and mancozeb are also excellent choices if applied before the disease is evident. 

Thanks to all of the golf courses that participated in the teetimes4turf auction to support our research at MSU. The auction which ends Sunday night can be found here.

Dr. J.M. Vargas, Jr.