Summer Patch & Necrotic Ring Spot Turfgrass Disease
Hot weather diseases (over 75 F)
When will it appear?
- Late spring-early summer
- The fungus attacks soil at 70F
- Excessive watering, heat stress, moisture, close mowing, high amount of thatch.
- Heat and drought will intensify disease
- Kentucky/annual bluegrass
- Fine Fescues
- Creeping bentgrass
- Patches, circular with dead or stunted grass.
- Patches not “greening” up fast in the spring
- Known as “frogeye”, or “Fisheye”
- Leaves may be tan or yellow
- Leaves stunted and wilted
- Roots and rhizomes may be dark and brittle and have black lesions.
Can you see the fungus?