Symptoms: This is one of the most common diseases for this area. Leaf spot begins with small, dark spots on the leaves and leaf sheaths. As the spots enlarge, they turn purple with a tan center. If this disease progresses, the spots may cause a collapse of the plant, leading to thinning ot “melting out” of the turf.
Conditions: The conditions that favor during cool, moist weather and causes yellowing and severe thinning if not controlled.
Recommended Treatment: Core aerations are helpful. Most importantly, continue with proper watering and mowing practices. Occasionally, a fungicide treatment may be needed.