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Treating Johnson grass on a pond shoreline is a tough one. Pastora is what we use in our hay meadows to kill Johnson grass, and it works great, but it's label recommends no runoff into a pond for 3 months. Weedar 64 is a 2 4-D product that's good for broad leaf weeds around a pond, but it won't kill Johnson grass.
Maybe use a BBQ mop, and treat each plant with a glyphosate? Cutting the seed heads off before they drop will help stop the spread also.
AL
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