Commonly available fungicides that may be used according to label directions are Daconil 2787, Dyrene, and Fore. Diseases Several diseases cause rings of dead grass with live green grass in the center. These can occur in both cool and hot, dry weather. Many other problems are similar in appearance and are easily confused with ring diseases. Managing moisture and fertility levels is an important aspect in controlling these diseases.
Symptoms are round circles of dead grass with green grass in the middle.
Sometimes there are purple or red grass blades around the margins of the spots. When possible, water for 20 minutes each day around noon to suppress the symptoms. Avoid moisture stress as drought favors these diseases. Make the November application after the grass has stopped growing. These fungicides may be used at the rate of 4 to 6 oz.