What are the first visible signs of Necrotic Ring Spot?

The first visible signs of Necrotic Ring Spot are indeed circular patches of dead grass. This disease primarily affects cool-season grasses and is characterized by these distinct circular areas where the turf looks brown or dead. Typically, these patches can range from a few inches to several feet in diameter, forming a ring of healthy grass around the dead area. This visual pattern is critical for accurate identification and management, as it differs from other turf diseases, which may present symptoms in various forms, such as spots or discolorations without a defined ring structure. Recognizing these circular patterns allows turf managers to swiftly assess the problem and implement appropriate management strategies to restore the health of the turf.