Fairy rings are almost always much larger in diameter and rarely kill grass in well fertilized lawns. Several other problems may also cause confusion, such as white grub infestation or Pythium blight. Lawns from two to eight years old are especially prone to NRS problems. There is evidence that some bluegrass varieties are much more susceptible than other varieties. Red fescues are susceptible, too, but perennial ryegrass is not.
Control is difficult.
It is suggested that cultural modifications are the best way to slow down the disease. Fertilize moderately to promote growth during April to mid-May, late August and early September, or late fall. Do not starve the lawn. Compaction is often times associated with affected areas. Aeration with a spading fork may be beneficial.