re: Torpedo Grass - Any hope, or should I concrete the lawn?

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Sethoxydim. Hit it twice over a few weeks.

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This will only suppress Torpedo Grass, not kill it.

OP, I am in the same situation. A couple of years ago I nuked my whole yard with glyphosate then reseeded centipede. I thought I had won the war.. But just a year later, the torpedo started gaining control again.

This year I am converting my whole yard to Bermuda so I can spray Quinclorac and finally kill that stuff for good.