Hi - I had this post in the identifing plant section, 51 looks but not even one suggestion! So, I thougt that I would repost here.

Maybe the pictures are not too good? Let me know if I need to take more. I suspect this is a common pond weed in the midwest, but maybe I am wrong! Thanks again for your help.
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I am thinking Southern Naiad or some form of pondweed (busy pond weed?
http://s1156.photobucket.com/albums/p580/jrwpmw/?action=view&current=da2ec49d.jpg

http://s1156.photobucket.com/albums/p580/jrwpmw/?action=view&current=6e1501d4.jpg

http://s1156.photobucket.com/albums/p580/jrwpmw/?action=view&current=aacf9c7b.jpg

I live in MO, this is growing like crazy. It's submerged, attached to the bottom; but not firmly. So you can rake it up or easily pull it up. It grows to the top in shallower water 1-2" deep, but is also in water up to 4" deep - but not to the top (at least yet). This is very thick and dense, like raking tall grass!

My next question is - what is the cheapest (lowest cost) chemical/herbacide that I can but to treat this?

Thank you as always!