Circle appearance - Knowledgebase Question

Grand Rapids, Mi
Question by jjnelson4
October 7, 2009
Completed fall fertilizer prep 2 weeks ago; notice a circle shape in front lawn about 12 feet in diameter; just perimeter of circle showing lighter greenish-yellow coloring. What is it?

Answer from NGA
October 7, 2009


A ring of yellowish grass surrounding green grass is sometimes called "frog eye" and is characteristic of Rhizoctonia yellow patch. Although it is recognized as a fungal disease, no fungicides are effective for control of Yellow Patch. Wet soils are usually to blame and while you cannot control rainfall, you can adjust your watering practices so the soil dries out quickly after watering. Aerating might also help. A core aerator will remove one inch by three inch plugs from the lawn. Leave the plugs on the lawn and they will dissolve in rain or water from the sprinklers. After aerating spread a thin layer of sand or compost over the area and water it in well. The sand or compost plus the soil from the plugs will work their way down into the holes left by the plugs.

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