During this spring and summer's extended rainy weather we have seen an increase in some diseases related to brown patch (a cool season disease) but which thrive in warmer temperatures. Summer patch and yellow patch are two prime examples. When the weather dries out a little more the problems should go away.
Some weed killers used when temperatures are in the mid 80's or above can stress and damage St. Augustine and may cause similar symptoms to what you described. Time is the best remedy. Fertilize the turf in the meantime with a product with a 3-1-2 ratio of nutrients such as 15-5-10. Divide the first number on the fertilizer bag into 100 to get the pounds of fertilizer to apply per 1000 square feet. Water it in with 1/2 inch of irrigation afterwards.
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