This bill mandates the cancellation of all registrations for the pesticide diquat, deeming it to cause unreasonable adverse effects on the environment upon its enactment. It directs the Environmental Protection Agency Administrator to immediately cancel all uses of diquat and revoke any associated tolerances or exemptions for its presence in food. The legislation also explicitly prohibits the continued sale and use of existing stocks of diquat from the date of enactment. To ensure its permanent removal, the bill forbids the EPA Administrator from ever reregistering diquat under the Federal Insecticide, Fungicide, and Rodenticide Act. This comprehensive measure aims to permanently remove diquat from agricultural and food-related uses.