Thanks Pond Frog, although I may have been misleading in the way I said I used it @ 50% rate.
Weedtrine recommends a 25:1 mix ratio @ 130 gallons of mix per acre, for Duckweed. My pond is approx 1/4 acre, so that would mean 1.3gallons of Weedtrine-D mixed with 32.5 gallons water.
I ulimately used 2 quarts Weedtrine, mixed with 12 gallons water, & 4oz of Cide-Kick. That would work out to a 24:1 ratio (close to recommended) but I applied it at <50% of recommended.
So I spray at the recommended ratio, but applied at < half rate. I believe, in hind site, that mixing at half ratio and applying at full rate(like you said) would give a higher chance of working. Better wetting. Luckily it worked for me, the way I did it. I thought wetting seemed good, but had never done it before?
Nice part is, I still have 2 quarts Weedtrine left for future use.
Here's a pic from this morning.
