Sonar Liquid with fluridone is a systemic herbicide for controlling weeds in fresh water ponds, lakes, reservoirs, irrigation canals and drainage ditches. Provides excellent control of many difficult to control weeds, including Duckweed and Watermeal while allowing desirable vegetation to remain. See Fluridone for smaller quantities.
For ponds of 10 acres or less in size, treat the entire pond or a minimum of 5 acres.
For lakes of more than 10 acres in size, treat a minimum of 5 acres. Treating less than 5 acres or treating narrow strips may not produce satisfactory results due to dilution.
Sonar Liquid is absorbed by leaves and stems directly from the water and by roots from hydrosoil. In susceptible weeds, Sonar inhibits carotene production. Without carotene, chlorophyll is rapidly destroyed by sunlight and without chlorophyll the weeds die.
Initial results show a bleaching at the growing tips of the weed. Within 7 to 10 days weeds begin to turn pink and then white. Growth is halted and plants begin to die. Results occur slowly. Under optimum conditions, full kill occurs in 30 to 90 days. Sonar will not cause oxygen depletion due to rapid collapse of weeds.
For best results, apply Sonar Liquid in spring and summer during the early stages of growth. Weeds are more easily controlled when treated at this time. Less material is required and results occur more quickly. Sonar Liquid works on susceptible mature plants but will require higher application rates and more time to show full effect of an application.
Consistent concentrations of Sonar need to be maintained in water for up to 45 days following application. Rapid dilution due to water flow will reduce results. Best results occur in ponds with little or no outflow.
To apply Sonar Liquid, determine the volume of water to be treated in acre-ft. Use 1/2 pint of Sonar Liquid per 1.25 acre-ft. of treated water. Dilute with 5 to 100 gallons of water and apply uniformly over water surface.
For Duckweed, split the calculated amount of Sonar Liquid into 3 equal portions. Apply each portion separately at 10 to 15 day intervals.
Water in areas treated with Sonar Liquid should not be used for irrigation for 30 days.