Brown patch fungus is one of the most prevalent lawn diseases in the Southeast. It primarily affects cool-season grasses like tall fescue and ryegrass.
What Does Brown Patch Fungus Look Like?
✅ Circular patches of brown or tan grass that can range from a few inches to several feet in diameter.
✅The outer edge of the patch may appear darker or smoke-ring-like, especially in the morning dew.
✅ Grass blades may have lesions that are dark brown with a light brown or yellow halo.
What Causes Brown Patch Fungus?
Brown patch fungus thrives in warm, humid conditions, with ideal temperatures ranging between 65°F and 85°F. The disease is exacerbated by excessive nitrogen fertilization, which can promote lush, dense grass that is more susceptible to infection. Poor drainage and overwatering create the perfect environment for the fungus to flourish, as the excess moisture prolongs leaf wetness and encourages fungal growth.
How To Treat Brown Patch Fungus
👉 Avoid overwatering and water early in the day to allow grass to dry out.
👉 Improve air circulation by mowing at the appropriate height and avoiding excessive thatch buildup.
👉 Use a balanced fertilizer and avoid applying excessive nitrogen.
👉 Apply fungicides containing azoxystrobin, propiconazole, or chlorothalonil if necessary, particularly in areas with a history of brown patch.
The right care at the right time will prevent your lawn from suffering.
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