United States Government Glossary of Interagency and Associated Terms/active ingredient (pesticide)

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active ingredient [pesticide] - substance (or group of structurally similar substances if specified by the Agency) that prevents, destroys, repels or mitigates any pest, or that functions as a plant regulator, desiccant, or defoliant within the meaning of FIFRA. (SOURCE - DHS, DHS Lexicon, Terms)