Often starting as small brown discoloured circles or patches as small as a few centimetres in size. The patch can grow in diameter up to a metre and a distinct grey-brown colour "smoke ring" can be observed around the perimeter of the affected area in the early morning. Infected leaves look water soaked and dark in colour, later dying. The disease can be found on the foliage and or turf root system.
Most warm- and cool-season turfgrass varieties. Symptoms can vary between turfgrasses as seen within the pictures above.
High humidity and warm surface temperatures (>25 degC), excessive soil moisture, poor drainage, excessive thatch and high nitrogen.
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