In the Gulf South when the weather begins to turn cooler in the evenings the thick lush St. Augustine grass develops a fungus we call brown patch. It also can occur in winter rye grass as well.  Typically the fungus grows in areas when humid and moisture is present in the thatch layer of the grass and usually happens during April and October in the New Orleans Area. 

So you have this problem and just want to fix it.  Here are a couple of things you can do to reduce brown patch in your yard. 

1. Do not fertilize if you notice the fungus in the yard.  It will make it worse.
2. Stop watering the yard which will slow the growth down.
3. Apply a fungus as directed by the label to control brown patch.
4. Rake affected area and remove the damaged grass.
5. Make sure you are using a mower that collects the cuttings rather than mulching.

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