It's sort of a PITA, but put some Tordon RTU in a small can or mason jar. Have a 1" wide paint brush in there too. When you cut down a willow, paint the freshly stump with Tordon RTU. They shouldn't come back.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).