Thanks for replies Cecil and Bill. I have 1.5 acre pond so I can afford a little more time screwing around with the weeds than you guys get to. The cattails in my pond are just so natural looking in their clumpings that I just cant poison them all right now. Hence the reason I was looking for a control mechanism. But I do want to keep them in their clumps and not let them take over so the Cecil's eradication program is on hold for now. But I did order one today on both of your advice. thanks,
Toby