Correct.... not trying to kill duckweed. When you get all of the cattails out and if there is some duckweed there, it seems to multiply pretty fast.... but other herbicides work well on duckweed and we have gotten great control with other products. Agree, glyphosate is a relatively safe chemical, in the right formulation.... and that is why we pretty much manage our marsh with it now that we have gotten it under control.
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