Necrotic Ring Spot is primarily a problem for which grass species?

• A. Kentucky bluegrass
• B. Red fescue
• C. Annual bluegrass
• D. Tall fescue

Answer: (A)

Necrotic Ring Spot is a fungal disease that tends to affect cool-season turfgrasses, and among the common grasses used in lawns and sports turf, Kentucky bluegrass is the one most commonly and noticeably affected. The pathogen colonizes roots and crowns and produces expanding rings of dead tissue, so Kentucky bluegrass stands often show the characteristic circular patches that can merge into larger areas. While other grasses like red fescue, tall fescue, or annual bluegrass can be involved under certain conditions, the disease is most strongly associated with Kentucky bluegrass due to its susceptibility and growth form. Understanding this helps explain why this species is identified as the primary problem host for Necrotic Ring Spot.