The Marlins have decided to shut down right-hander Josh Johnson for the remainder of the season. Florida is hanging in the National League playoff race, but they want to be cautious with Johnson's back injury. "It's just the smart thing to do," Johnson said. Johnson was scratched from a start last week after a strained muscle near the middle of his back forced him to end a bullpen session. He is 11-6 with a 2.30 ERA and 186 strikeouts this season.