coolpond, you named the experts and I'm not one of them, but I do know when I treated my 2 acre pond for an infestation of Coontail and a fully blanketed pond of Duckweed, the late-great Ted Lea told me, as far as application, all you need to do is "get it wet". He said it would evenly disperse throughout the pond. For me, since I have 4 diffusers, I just poured it equally over each bubbler and it did it's job.
Also keep in mind Fluridone is a complete vegetation killer, especially at 90 ppb. So if you have any other pond weeds, grasses, etc., you may want to say your goodbye's before they turn white and die.
The second year (2013) I applied it again to prevent any CT "shoots?" that may have survived, at 45 ppb (IIRC) and have not had any Coontail since. Yet I also stocked 8 12" GC after the first treatment to control anything new. Those I would now like to remove!
Again, I'm far from an expert and will likely be corrected but this is what I recall. It was great for me as the CT was so bad I couldn't even row a boat through it. And about 5-6 weeks later, the pond was void of ANY vegetation (excluding algae).
Very pricey, yes but for me it's what I needed and I have no regrets.
Keith - Still Lovin Livin
https://youtu.be/o-R41Rfx0k0(a short video tribute to the PB members we met on our 5 week fishing adventure)
Formerly: 2ac LMB,HSB,BG,HBG,RES