Thanks Bill but there is no restricting of cattails. I went from freshly dug "pond" to total cattails in 2 summers. They were so thick that the blacksnakes were able to run along the tops of the cattails chasing after the frogs. I have been told that frogs are especially sensitive to even the approved herbicides because they absorb things through their skin. My main concern is that the turtles not snap at my wading grandchildren and the frog diet is secondary. There can't be many frogs which have moved out as the decible level is still very high.