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Largeleaf Pondweed (Potamogeton amplifolius) is notorious for its resistance to herbicide treatments. Found in the upper one-half of the United States.
Aquathol Super K or Hydrothol 191 granular is a good choice but maximum label rates are recommended. If other plants are present that require control the good news is that improvement is most likely assured with these broad spectrum herbicides. You may want to control a monotypic stand of Largeleaf Pondweed by cutting. See below.
Largeleaf cuts more easily than many aquatic plants and will not regrow the same season. See Water weed cutter.
Once water temperatures are around sixty degrees or warmer and the plants are viable
Granular herbicides can be spread by a small Hand held spreader or can be tossed by a hand scoop.
Controlled Largeleaf will not grow back the same season.