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.


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