We recently purchased a new home that has a .40 acre pond that has an average depth of 6 feet. Shortly after moving in I noticed what I thought was a pollen but I soon found out it was watermeal. I got some Weedtrine-D and that worked well for a little while. Now its back with a mission to take over the pond. I sprayed again and it is turning out to be just a short term fix. I was planning on using Sonar next spring but wonder if I should treat it now since we are in Georgia and the temps stay warm late into the year. One of the challenges with the pond is runoff from the yard runs into the pond and the previous owner used a lot of phosphorus on the yard before he out it on the market. With that said should I just continue to spot treat with weedtrine-d or go ahead and treat with Sonar?

I'd use Clipper. If the water levels fluctuate and you have inflow/outflow the Sonar won't work the best. It has to have a certain PPB concentration in the whole water column for 30-60 days.

Water levels are pretty steady and there is no inflow and to overflow it would have to raise over 1.5 feet. I'll look at Clipper.

If there isn't water inflow for the time required for the Fluridone to work, then I'd go with it, and make sure that I kept the 90 ppb dosage rate for 45 days.

AT 90 ppb if there are any other aquatic plants they will be gone too. Getting a little risky this late in the year to be using Fluridone. Clipper is going to work faster thus if you have to treat again you can do it sooner rather than later.