Sorry I don't have pictures for you, but the rodeo is working at about 3 oz per gallon with surfactant.
Bill Cody is right on the three week thing. The leaves yellow, then fall off, leaving the stem. Then, sooner or later the stems start falling. It's a fairly slow process.
But, I think, with a schedule, one weekend day per month, I can get em all knocked out eventually.
My neighbor is on board. He say he hasn't seen this much spatterdock in any previous year. Looks like I'm green-lighted to treat the entire pond.