Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Pond Weed Control and Dogs

If you go with Hydrothol, be sure and apply it at the recommended dosage. More's not better.

From the Hydrothol label: "Fish may be killed by dosages in excess of 0.3 parts per million (ppm)." It happened to me one time, not a lot of fish, but I did lose some smaller fish that were residing in coontail.

EDIT: I have used Hydrothol on freshly emergent coontail that did not grow all the way to the surface, and had no issues.

Good advice already given about GC. I'd rather have 10 too few, than 1 too many. I've had them for 5-6 years now, and I still haven't hit my permit amount.