Most of the time, watermeal is the last weed standing. And things that kill duckweed might have no effect on watermeal. Nuke the entire pond with Fluridone and start over. Put some new plants in to prevent nutrients from starting the entire process over. I don't think bumping up the concentration of active ingrediant is going to get done what you want. In fact, you may actually end up helping the watermeal by killing off everything it competes with.
PF, I hope that's not what I find when I get out there on Sunday. But, if need be, I'll go nuclear and wipe it all out. I've been giving a lot of thought to going the desirable plant route and will likely do that. I just want to see what happens here first, though.
If I escalate the fight, what sort of fluoridone product do you suggest I use for the kill off?
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