One product out on the market is a foam, produced by Roundup called Weed & Grass Killer Sure Shot foam. This is a systemic that is absorbed by the plant and kills the whole plant. It works best in full hot sun. Wear gloves to remove the dead stems and bury them or put them in a garbage bag. Do not try to burn the debris as the smoke can also cause allergic problems. Glyposate (Roundup) also works but it will kill everything.