Which of the following is a characteristic of necrotic ring spot?

Necrotic ring spot is primarily characterized by its impact on high-maintenance lawns, particularly on cool-season grasses such as Kentucky bluegrass. This disease manifests as distinct circular patches that can vary in size, leading to significant visual damage in well-groomed turf areas. The presence of these symptoms can severely affect the aesthetic quality of lawns, which is why it is often a concern for turf managers and homeowners who prioritize the appearance of their grass.

While necrotic ring spot does indeed weaken the overall health of the turfgrass, the emphasis in this question is on its association with high-maintenance lawns. The other choices describe effects that are not typical for necrotic ring spot; they relate to different plant diseases or conditions. Thus, the focus on high-maintenance lawns underscores the specific impact of this disease in turf environments.