Diquat burns the leaf tissue back faster than the 2-4D and Roundup can translocate through the plant to actually kill it. I have never killed anything with Diquat. I only use it to burn plants back and then set them on fire. I have been spraying aquatics on golf courses for years. The generic roundup works well with surfactant. If you really want to kill it off use some Clear Cast from SePro, but its not cheap.
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