Steve from Linden Michigan writes
According to the product label, you should wait 24 hours after applying Diquat Water Weed and Landscape Herbicide for any swimming or fishing in theses treated areas. It is recommended that you treat your pond in sections as to not deplete the oxygen in the water. The amount of product will depend on the depth of your pond. If your pond is 1 foot deep, you will use 0.25 gallons. If your pond is 2 feet deep, you will use 0.5 gallons. If the pond is 3 feet deep, you will use 0.75 gallons. For a 4 foot deep pond, you will use 1 gallon of products. This is per acre. Diquat Water Weed and Landscape Herbicide should be applied at a rate of 1 to 2 gallons per surface area of water. For a 1 acre lake or pond - spray 1 to 2 gallons of Diquat into the lake. If using a hand sprayer, for example, 2 gallon sprayer, put 1 gallon of water and 1 gallon of Diquat into the sprayer and spray the contents over an acre of the area. Per the product label, it should be applied in the spring or early summer when the weeds are actively growing and when water temperatures have reached or exceeded 50 degrees.
Answer last updated on: 05/18/2021
