I just spoke to a chemical salesman yesterday about this problem. Rodeo is an aquatic glyphosate which is the same as Round-up with and aquatic use label. Diquat is an aquatic 2,4-D which is the same as 2,4-D with and aquatic use label. As stated before, don't get caught using chemicals not labeled for aquatic use. Do a tank mix according to the labels. You will have to do numerous applications as it's not going to be a one time deal. Once you have a knock-down reapply anything remaining. Keep doing this until it is gone.
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