Reward is trade name for Diquat. it will burn it back, not kill it. In my many years spraying ponds and lakes on Golf Courses, I have never had Reward (Diquat) kill anything and it is pretty damn expensive. Also, do not get caught spraying Roundup in water. It is not labeled and can come with a hefty fine. The Aquatic Glysohates like AquaNeat, Aquamaster are basiccaly Roundup with a spreader sticker added so it will stick to the plants leaf tissue. 2-4D will also help. Mix some 2-4D with a Clay floor dry in a bucket, and chunk it out in variuos spots, this will allow you to get the chemical below the surface. also mix it with the Glysophate for spraying on top
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