 Applying fungicides that contain chlorothalonil, maneb, mancozeb, or metalaxyl as the main ingredient on a regular schedule will help to eliminate the pathogen.You can also apply fungicides containing mefenoxam to the soil surface under the vines around 4–8 weeks prior to harvest.A third practice to help control the disease is to spray with another fungicide, difolatan, 4 times over a 10-day period.