Cinch bugs are not grubs. The adults are very small like an ant.
White body with a dark stripe. The really hard ones to see are the babies they are red and a little smaller than the period at the end of this sentence.
I was shown to take a piece of white paper to the edge of the dead area adjacent to new grass. Pick up a bunch of the dead grass at the edge and throw it on the white paper. Spread it around and if it is cinch bugs you will easily see the adults....then look harder for the little red dots walking around.
btk
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