An area of St. Augustine grass has suddenly turned brown and died. the My dad's lawn has developed the same thing (he lives in the Houston area and I live in DFW). He noticed that it started and progressed rapidly when it got hot and a little dry. In this area of my yard, there is no shade, plenty of water, and plenty of healthy grass around in. There were no signs of fungus or gray spot, and it came on in July. I have had this problem in the same area before and it has grown back over time ( a couple of years). I have seen this problem in other lawns. Its not a completely dead area - there is some healthy grass throughout. What could be the problem?
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