Pond Boss Forums INTRO Questions & Observations Cattail question.

+1

If it's not listed on the label as safe to use in the water and you do, and bad things happen, then there's the possibility of being liable. The label is law, if it isn't rated for pond use, then it hasn't been tested in ponds.

Round-up is at the most what, 53% Glyphosate? What's the other 47%? (That's the part that is not rated for pond use.)

Bruce:

Either dig them up with heavy equipment or spray them with an 8% glyphosate mix with 1-2 oz of non-ionic surfactant added to each gallon of tank mix. Wet them to just to the point of herbicide run-off, trying to wet as much of the growing cattails as possible. If he pays attention to how he's spraying, and gets 'em all, then they should all die. Like what was said, it might take 2-3 applications, depending on how good he is with the sprayer.

Add 1-2 ounces of pond dye to the sprayer to see what was sprayed if a little blue dye doesn't bother him. (either in the water or on him, depending on how careful he is)