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Brown patches on the lawn can pop up for a variety of reasons. Here are a few of the main ones: Fungal Diseases: One of the usual suspects is a brown patch fungus, especially when the weather is ...
Brown patch symptoms differ depending on the various maintenance practices performed on the turfgrass (mowing height, fertilizer, watering, etc.) Symptoms on turfgrasses that are wet for extended periods and are closely mowed will produce a distinctive gray-purplish bordered ring "smoke-ring" that is up to 50 cm in diameter. [3]
These patches are about 5 to 10 cm in diameter, but can grow to be about 1 meter in diameter. Eventually, as the infected turf dies, the spots turn brown. Within the patch, there may be areas of living grass at the center, creating a frog-eye appearance that this pathogen is known for.
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Brown ring patch is most destructive when the weather is humid and temperatures are stressful to the grass. Thus, in cool-season grasses such as tall fescue and perennial ryegrass, the disease is most severe under high temperatures (highs above 85 °F (29 °C), lows above 60 °F (16 °C)).
The first signs of infection are small irregular patches of brown/yellowing grass. Upon closer inspection, either the tiny red needles or the pink fluffy mycelium will be visible. As the infection spreads, the small patches will join to form large brown areas.