William from Indiana writes
If you are applying Diquat Water Weed and Landscape Herbicide to floating weeds such as duckweed, then you want to spray the weeds from above from the shore or from a boat. If you are treating submerged weeds, then you could potentially pour the herbicide into the water, however whether this will be effective may depend on the specific target weeds. Be sure that you follow local regulations regarding the use of aquatic herbicides in areas that connect to public waters and check the full product label regarding your target weeds.
Answer last updated on: 04/13/2021