Buffalograss, like centipedegrass, is a warm-season perennial grass. There is no selective herbicide that will kill one and not the other. If you have patches of the buffalograss in the centipede lawn you can spray the patches with glyphosate (Roundup) to kill the unwanted grass. Use caution, because Roundup will also kill centipede grass if accidentally sprayed on it. A week or two after spraying, you can plant plugs or sprigs of the centipedegrass in the dead areas.
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