What is an inert ingredient?
Pesticide products contain both “active” and “inert” ingredients. The terms “active ingredient” and “inert ingredient” are defined by the federal law that governs pesticides (Federal Insecticide, Fungicide, and Rodenticide Act [FIFRA]). An active ingredient is one that prevents, destroys, repels, or mitigates a pest, or is a plant regulator, defoliant, desiccant or nitrogen stabilizer. By law, the active ingredient must be identified by name on the pesticide product’s label together with its percentage by weight. All other ingredients in a pesticide product are called “inert ingredients.” An inert ingredient means any substance (or group of similar substances) other than an active ingredient that is intentionally included in a pesticide product. Called “inerts” by the law, the name does not mean non-toxic. Pesticide products often contain more than one inert ingredient. Inert ingredients play key roles in the effectiveness of pesticides. Examples include inerts that prevent caking or f
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