I'd like to add a question to his post above.

Is the 2,4-D a systemic poison like Renovate OTF, or is it like Diquat? Will 2,4-D kill the roots as well, or just burn off the tops leaving it ready to pop back up next year?

I used diquat last year and while it killed the milfoil, it's back again this year. I have smaller patches than Bassman70, so I'm going to hand pull the individual plants, then hit those areas with a systemic poison in a month. Hopefully that will be the end of it.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).