- Apply a commercial lawn fungicide containing propiconazole according to the package directions (typically 1 pint of fungicide per 1000 square feet of lawn). Do not water the lawn after application, so the fungicide has a chance to soak in.
- Wait at least 4 weeks, and then reapply if necessary.
- You may need to apply the fungicide again in the fall if the fairy rings reappear.
Cultural Treatment
- Cut the grass regularly, and remove the clippings. Do not compost grass clippings that have been cut from a fairy ring.
- Thatch your lawn regularly, and add compost or other organic matter to the soil to improve drainage and aeration.
- Water the lawn deeply and infrequently, so that the water penetrates the soil evenly and deeply.
- Apply fertilizer according to the soil test recommendations.
- Mow the lawn more often to reduce thatch build-up, and apply fertilizer twice a year to encourage vigorous growth.
- Aerate the lawn regularly, especially if it is compacted, to improve drainage and oxygen circulation in the soil.
Biological Treatment
- Apply mycorrhizal fungi beneficial bacteria to the soil around the edges of the fairy ring may help control it. Look for products that are labeled for this use.
- Apply the beneficial bacteria, and water according to the package directions.
- Wait at least 4 weeks, and then reapply if necessary.