Help identifying lawn disease
I am located in southern New Hampshire on the Massachusetts border. I have a lawn disease that first showed up about a month ago. I thought that the diseased spots would die off and new grass would fill in, but it seems to keep spreading to other parts of the lawn. I have an irrigation system and water at 4AM everyday. I fertilize using the Scotts system and have thus far done steps 1 and 2. I have attached a couple of photos. Can anyone help identify this disease and what I can do to get rid of it? Thanks, Jeremiah.
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