Necrotic Ring Spot

Grasses Susceptible to Necrotic Ring Spot

  • Annual Bluegrass
  • Rough Bluegrass
  • Fine fescue
  • Kentucky Bluegrass

Symptoms

Necrotic Ring Spot first appears as thinned, circular patches that are yellow to light green and approximately 3-15 inches wide. The patches can expand up to 3 feet wide and eventually turn brown and straw colored and die. The roots and rhizomes of the affected turf turn brown to black. The disease sometimes causes a symptom known as “frog eye”, in which some grass survives inside the dead patch, creating of damaged turf.

Favorable Conditions

Necrotic Ring Spot initiates in moist soil, thrives in temperatures up to 80 degrees and becomes more severe in higher temperatures and drought conditions. Newly seeded or sodded areas are susceptible to the disease. It is also found in areas with compacted soil and high nitrogen levels during the spring and summer.

Management

  • Reduce soil compaction and thatch via core aeration
  • Maintain adequate nutrients in soil through proper fertilization
  • Avoid drought stress through proper irrigation practices
  • Raise mower height
  • Minimize shade

Crabgrass

Kentucky Bluegrass

Dollar Spot

Bahia Grass

Perennial Ryegrass

Fairy Ring

Bermuda Grass

Tall Fescue

Necrotic Ring Spot

Get A Free Estimate

Consistently striving to make decisions that positively influence relationships with our co-workers and customers, we’re committed to keeping strong company values, vision and systems to provide a measurable outcome.

Contact Us Today