Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants duckweed help

is thier anyway to get rid of duckweed without chemicals. the pond is very old. i have areated and sprayed the heck out of it and duckweed keeps coming backi have put more then enough weed killer in thier and all the weeds are gone except the duck weed. the pond was basically dead and now i have blue gills in it and they seem to be doing good. thanks
paul

It will freeze out this winter. Then, next spring, watch for it and spray as soon as you see young plants on the comeback.
Oh yeah, be sure you have correctly identified the plant....sometimes I take that for granted. Biggest boo-boo I see in the business is missed identification of target plants.

Which herbicides have you used, Paul?

yes had it identified as duckweed. have used copper sulfate and reward. frog and tadpole population is very large. i only stocked small blue gills and they seem to be doing quite well. i also put a lot fat head minnows in their yesturday and they are eating the duckweed. no way they can control it but was surprised to see them eating it. thanks for your responses. we just moved in this home this past winter and love it. the pond is close to the house and want it to look its best
paul

also pond is spring and rain fed. no livestock and no inlet or outlet

Consider Sonar next spring, if duckweed rears its head. Sonar, by SePro, works well on duckweed.

Bob,
Great suggestion. Sonar treated as soon as the duckweed starts along the shoreline is the time to treat. You will see one or two plants coming to the surface. Yes, make sure ALL of the plants are duckweed. Many times watermeal will also be present with duckweed. The duckweed will drop out leaving watermeal. Watermeal will also die, but may take longer-60-90 days. This timing is different for areas around the US-as you might imagine.