My experiences. I have three farmer friends that use Roundup in their ponds for years now with no known problems. I try to have a natural pond but I did spray full grown cattails in front of my deck in the middle of last summer and the kill was complete with none showing up so far this year in the sprayed area of about 50x50 feet. I use Eliminator from Walmart for about $ 10. I did small sample sprayings using different strength with and without dishwasher sufficient. I had dozen of minnows try to eat the spray bubbles on the water with no ill effects. The spray that really worked for me was 4 ozs. of Eliminator to one gal. of water or the whole bottle makes 2 1/2 gallons as I remember.
