Lawn fungus is caused by different environmental conditions, and it is quite difficult to identify and treat accurately. As mentioned earlier, the best way to treat it is to identify what kind of fungus you're dealing with. I have to agree that treating it with fungicide isn't the best option, as the chemicals may kill the grass and not just the fungus.
Here are the more common diseases that I've heard of: Brown patch, dollar spot, fairy ring, leaf spot and pythium blight.
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