I found the listed ingredients in Rodeo and Roundup to be the same - so switched to Roundup because it was much cheaper - and now that you can buy Glystar that is even cheaper yet. I use it on cattails to keep them in check.
Am I missing something here ?
Only that it is technically illegal to use a product off label and that the carrier for the aquatic version of glyphosate is likely different. The carrier in Roundup and generics could be something that is less desirable or harmful in water bodies. Not the glyphosate itself (the "active ingredient"), but the solution that delivers it.
Using product illegally could incur the wrath (and associated fines) of "big brother". Kind of like breaking the speed limit or breaking other laws. If you choose to do so, at least do so with the knowledge of potential negative consequences.
Using the correctly labeled product is likely the best route, after all possibilities are considered.
Edit: If you have lots of it, don't kill off large amounts all at once or you could have a fish kill by having too much decaying vegetation in the pond all at once causing a DO crash. Kill it off in sections at a time if you have lots of it.
