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boat traffic
This selective herbicide has less to no impact on grasses
bullthistle
a second application is required for subsequent protection from leaf yellowing
Better yet
AmphiThal Aquatic Herbicide (Aquathol K) jug (2.5 gal) Winter-Group boat trafficSharda AmphiThal is a professional use aquatic herbicide for control of submersed aquatic weeds in quiescent, slow moving, and flowing water sites. Formulated with dipotassium salt of endothall, AmphiThal provides contact activity on labeled aquatic plants such as pondweed, hydrilla, milfoil, naiad, coontail, parrotfeather, sago pondweed, and water stargrass. AmphiThal may be applied as a surface spray or injected below the water surface, depending on
