Red Thread is less common on which grass?

• A. Kentucky bluegrass
• B. Perennial ryegrass
• C. Fine fescues
• D. Tall fescue

Answer: (A)

Red Thread is a cool-season turf disease caused by a fungus that thrives when growth is lush and conditions are cool and damp. It tends to appear more readily on fine-textured grasses with slender blade leaves and on grasses like perennial ryegrass, where the thin blades provide easy access for the fungal threads to spread under those conditions. Kentucky bluegrass, by contrast, has a different blade texture and growth habit that are less favorable to this pathogen, so outbreaks are less common there. So, among the options, Red Thread is least common on Kentucky bluegrass. To help prevent it, keep balanced nitrogen, avoid overwatering, and maintain proper mowing height.