If you see circles pop up, also include a curative control on and around the circles. To prevent it in the first place, start with one of the preventive controls listed below NOW, and do it again in 30 days. And, when possible, remove grass clippings during periods of disease activity. Water early in the morning to remove dew and allow the grass to dry quickly. First, remember the severity of the disease can be managed to some extent by avoiding heavy applications of nitrogen during spring and fall. A dark, grayish-black ring of wilted grass often is present around the perimeter of the diseased areas in the early morning. The affected leaves wilt and turn light brown, but remain upright. With cool-season grasses, the disease first appears as dark green, water-soaked circular patches that range from a few inches to several feet in diameter. Those fertilizers, however, are almost always national brands, not those recommended on GardenLine. High levels of nitrogen may increase the severity of the disease, so products touted as “fall fertilizers” that are very high in nitrogen can make it worse. Fungal activity generally stops when air temperatures reach 90 F. As the disease develops, the circular patches enlarge, the rings become more apparent, and new green leaves may emerge in the center of the circular areas. Symptoms first appear as small circular patches of water-soaked, dark grass that soon wilt and turn light brown. The leaves can be easily pulled from the stolons within the ring because the fungus destroys the tissue at the base of the leaf sheaths.
The most common is a circular pattern of brown grass with a yellowish ring (a “smoke ring”) of wilted grass at the perimeter. In warm-season grasses, the disease is characterized by at least two symptoms.
F STOP FUNGICIDE PATCH
That’s when brown patch starts to spread. As we head toward a temperature range I call the “80-60 split,” we have to be really mindful of this disease, and forecasts for the coming two weeks are calling for daytime highs in the 80s and overnight lows in the 60s. With wetter conditions and slightly cooler fall temperatures (insert joke here about “cool” Houston weather), brown patch can be a challenge for many homeowners.
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