Brown patch is a fungal disease and therefore needs an anti-fungal chemical
treatment. Any good brand of fungicide listed as treating for brown patch
will do the job. It's easier to use the brands in the bottles that are
already mixed & attach to your hose-end (unless you have a large homesite
to treat, in which case get the concentrate and use a hose-end sprayer or
similar). Just be persistent, follow directions, and treat the affected
area and beyond it to cure your lawn of the disease.
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