Try using Gordon's Brushmaster.This is a powerful herbicide and can kill desirable vegetables, flowers, ornamental plants,shrubs,and trees. I had great success this past spring killing off poison ivy that had entwined itself on a chain link fence. The key is to spray during the active growing season of this plant and not on a windy day. Grasses that are affected by this herbicide are:carpetgrass, dichondra, St. Augustingrass, bentgrass and clovers. Good luck and happy spraying.