We have a co-op that leases a section of sea wall on the Ausable (Southern Ontario). we had a major problem with lily pads, so Dad and I got the bright idea of essentially lassoing the pads (about 100 or so feet of kevlar rope and a bunch of big washers to weigh it down) we would surround a section of lily pads with the line, the washers would sink it to the bottom, then we tied it to the back of the boat and just drove away, took two or three seasons of that and we have been mostly free and clear ever since. given the size of the pond I'd imagine you could do the same thing with a canoe to set the line and a tractor or pickup to pull with.
