Ron from Williamsburg, Va writes
For treating for Hydrilla, which is a submersed water weed: To control submersed weeds, apply Diquat Water Weed and Landscape Herbicide in water at 0.5-2.0 gallons per surface acre (per 4 foot water depth). For severe weed infestations, use the 2.0 gallon per surface acre rate. For best results, re-treat as necessary on 14-21 day intervals. The table below shows how many gallons of Diquat Water Weed and Landscape Herbicide to apply per surface acre based on water depth. Gallons of Diquat Water Weed and Landscape Herbicide per Surface Acre Average Water Depth 1ft 2ft 3ft 4ft 1 gallon/acre rate 0.25gal 0.50gal 0.75gal 1.0gal 2 gallon/acre rate 0.50gal 1.0 gal 1.5gal 2.0gal Subsurface Applications: Where the submersed weed growth, especially Hydrilla, has reached the water surface, apply either in a water carrier or an invert emulsion through boom trailing hoses carrying nozzle tips to apply the dilute spray below the water surface to insure adequate coverage. Please let us know if you have any other questions, or give us a call at 1-866-581-7378 since many times with these types of applications, a customer service representative can better explain application techniques.
Answer last updated on: 07/08/2013