Brown Patch
Rhizoctonia solani

Rhizoctonia solani
Brown Patch is caused by a fungus and usually occurs in late spring, summer and autumn when the weather is warm and humid. Bent grass is very susceptible.
It starts with small discoloured patches of grass which later spread to form irregular dead patches a metre or more in diameter.
Lawns should always be watered in the morning (rather than in the late afternoon or evening) so that the foliage is dry before nightfall. Moisture sitting on the lawn overnight increases the chance of disease infection.
As soon as symptoms of brown patch are noticed, apply Yates Mancozeb Plus Fungicide over the lawn using a sprayer.