A nonactive ingredient in a pesticide formulation is called a formulant.

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Formulants are the non-active ingredients in a pesticide formulation. They’re included to help deliver and apply the active ingredient effectively, improving mixing, stability, spread, and adherence. Because formulants cover all components other than the active ingredient, a nonactive ingredient is indeed called a formulant. While a formulant can be a carrier or a solvent, those are specific types of formulants rather than the general term.