Back when I lived in Florida, chinch bugs were always one of the things you had to watch for in St. Augustine grass.
Picture here: https://rootbadger.com/shortened/cxak9dbcu
They would hit a lawn and you would think it was just heat or dry spots at first. Then the patch would keep spreading even when the sprinkler was doing its job. Little tiny things, but they can make a good yard look rough fast.
What I learned was to actually get down and check the grass instead of guessing. Part the runners, look near the edge of the bad spot, and see if they are moving around down in there. If you wait until the whole patch is straw-colored, you are already behind.
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CornfedByte
-- old newsreader habits die hard
CornfedByte
-- old newsreader habits die hard