Could also be widgeon grass which is not as bushy as sago. I have a few ponds also this year that have had both American Pondweed and Sago both come on strong that have not had issue with either in the past.Sago if held incheck with granular early in the season (Hydrothol 191 for example) are a great addition to most ponds.Directed injected diquat applications are also very effective. It can attract water fowl however.CJ is right on target.
