Katana® Turf Herbicide kills Poa annua, ryegrass, tall fescue, and the toughest broadleaf weeds in turf. Katana even works in cooler temperatures where competitive products may struggle. Katana is highly selective in seashore paspalum, Bermuda, zoysia, centipede and buffalo grasses, making it excellent for effective weed control in warm-season turf or removal of overseeded cool-season grasses.