Looking into using Rodeo. It appears they suggest spraying when the cattails are mature. I would assume this would be July/August for us Nebraska folks. I was hoping not to have to wait that long as I'd like to try to spray half now and half fall to try and eliminate a big decrease in oxygen levels from the decaying. Anyone had good luck last spring early summer? From what I can tell on the label I'm going to try the 1.5% mixture unless someone has other positive suggestions? Thanks