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Sticker (surfactant) is beneficial in applying pesticides, and necessary for some, most notably Manage. But it does not make your application waterproof. Surfactants act by breaking surface tension of the water droplets and allowing them to adhere to the weed leaf better. Thus you have more of your application working on the weeds, and achieve higher efficacy and probably a quicker rainfast effect.
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Jim
North central Indiana
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