What is a common disease affecting turf that is characterized by circular patches?

Brown patch is a common turf disease that manifests as distinct circular patches on the grass. This disease is caused by the fungus Rhizoctonia solani, which thrives in warm, humid conditions, typically affecting cool-season grasses.

The circular patches are often tan or brown in color and can vary in size, creating an irregular or patchy appearance in the lawn. Brown patch tends to develop during the late spring and summer months when temperatures rise and moisture levels are high, making it a prevalent concern for turf managers. Identifying this disease early is crucial for effective management, as it can spread rapidly under favorable environmental conditions.

Understanding the characteristics of brown patch, including its appearance and preferred conditions, helps turf professionals implement preventative measures, such as proper watering practices, appropriate fertilization, and maintaining healthy grass through cultural practices. This knowledge is essential for effectively managing turf health and minimizing disease outbreaks.