Chinch Bugs or St Augustine Decline -- Which?

I seem to have chinch bugs in this area in early fall every three or four years. Whatever this is, it's about a month to a month and a half late and the "tin can test" didn't show chinch bugs. Is this St Augustine decline, which I've never had before?
    http://factsfacts.com/st_augustine.htm
If so, do I do anything about it?
jim
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The edges of the areas are rounded which would indicate chinch bugs. Treat with bug powder and reduce the amount of irrigation to the spots. Better yet, rip out the grass and plant shrubs and trees or use hardscape.
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You have brown patch, very common in October-November. Cinch bugs are seen in the summer, brown patch appears when it gets cooler. You can knock it out with a fungicide. Don't waste your time with a pesticide.
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