For the control of undesirable emergent and floating aquatic vegetation in estuarine marine surface water. Also for the control of undesirable vegetation in fencerows, non-irrigation on ditchbanks, wildlife openings, and industrial non-cropland areas including railroad, utility, pipeline and utility plant sites, petroleum tank farms, pumping installations, storage areas, transmission lines, and industrial bareground areas. Active ingredient: Isopropylamine salt of Imazapyr 28.7%.