Bob,
Are you using the granular or the liquid this time?
I don't use any herbicide on the the trout pond for the Chara because it has copper in it. Trout and Grass Carp are very sensitive to copper. I may be able to get away with the Cutrine Plus granular in the trout pond due to my extreme hardness and low temps but I'm not willing to take the risk. I've also noticed when I rake it in there is dead Chara underneath the live green Chara. I prefer to remove mechanically to get as much of the live and dead Chara out as I can. As we all know decomposing vegetation can consume oxygen.
I am presently removing the Chara from two ponds with a weed rake. It's the big one with the nylon teeth about 10 inches long. I have a wheel barrow that I dump it into right away, and then haul it to another place on the property. A pitch fork helps to gather it up if I miss the wheel barrow. I use two orange survey flat markers and do a little each day. I space the flags about 4 feet apart and rake that section all the way out to the middle of the pond until I can't bring any more Chara in. The next day I move the flags over 4 feet. I do this twice a year. Hopefully with the one pond that has the yellow perch in it I will have enough grass carp in it to keep the Chara under control. All the fish in that pond will be in cages with a feeding ring so the Grass Carp will have no choice but the eat the Chara unlike another one of my ponds where they are feeding on pellets with the rest of my fish.
