We live in Mid-Missouri and I just discovered this site for info on American pondweed control. We have a 3/4 acre pond and in the last 2 years have pondweed taking over. It extends out approx. 8'. It is just now emerging since spring is in the air. What should we do to begin the demise of this? Should we start the treatment just as it is emerging again for the season or should be wait until it is up really good? astubbs