Brown Ring Patch (aka Waitea patch) is starting to show up on golf course putting greens at this time.

This disease is caused by the fungus Rhizoctonia circinata var circinata and typically develops during warm weather from April through June. Symptoms start as small yellow rings (0.25-2 inches wide) with green grass in the center and can ultimately reach a foot or more in diameter. The yellow rings can turn an orange or brown color as the disease progresses. [Read more…]

The leaf spot phase of this disease, caused by the fungus Drechslera poae, is apparent on susceptible Kentucky bluegrass turf at this time.

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