Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? 20 + year old pond, needs help

I've had good luck controlling Watershield with a herbicide called Habitat. You have to be careful not to go over the recommended application rate, especially if you have trees or plants living next to the water - the herbicide will translocate to those plants and kill them too. I have successfully treated a 3/4 acre pond with Watershield with the Habitat and it had cypress trees growing in the pond, and it didn't hurt the cypress trees. I was careful not to treat it heavily around the cypress trees, I only used about 50% of max strength.

I sprayed 1/2 the pond, came back 3 weeks later and sprayed the other half. Follow the directions, add an aquatic surfactant and I also added pond dye to the tank mix to allow me to see where I was spraying and how heavily I was applying it.