A herbicide and crop desiccant, especially in seed and potato crops. It generally makes its way into drinking water supplies through runoff from these herbicides. Diquat poisoning in humans may cause damage to the lining of the gastrointestinal tract, brain, liver, kidneys and lungs, but long-term exposure effects of this kind have not been greatly reported. It has been known to cause cataracts and birth defects in animals after prolonged exposure.

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