I have a pond on my property....it is roughly 1/3 acre. 3 areas around the pond are being over-run by a form of willow that grows as a single "whip". It started on the end of the pond in one area but they are spreading all over. In the picture, the largest area has some "whips" that are 2" in diameter at the base closest to the pond edge and get smaller as they go outward.

The 2nd largest area has the smallest ones at 1/2" - 1" diameter.

The smallest area has in-between sizes and some other nuisance plants.

They are also growing in all areas at the edge of the pond in the 1/2" - 1" diameter range.

I'm trying to figure out how to get rid of them.