Look into Arrowhead. That will create root to hold things together too.

Check out Sonar A.S. They treated a local lake with it in a low dose to control EWM and Curly Leaf. Around this time of the year is when the Curly Leaf dies back naturally.

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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).