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Brown Patch on grass appears as small circular patches of dead grass. The circular patches can range in size form a few inches to several feet in size. The patches are caused by a fungus called Rhizoctonia solani which attacks all types of turf grass. Brown Patch is one of the most prevalent turf disease and is most aggressive in warm, humid locations.
At the first sign of a Brown Patch infection, spray the lawn with Monterey Complete Disease Control. Repeat the spray 3 to 4 times every 7 to 10 days. Reduce the use of nitrogen fertilizers and reduce watering. When watering the lawn, only water in the morning.