Your research pulled up the correct definition, but the reality is that in terms of human health, inerts (sometimes called "other" ingredients) can be just as toxic as the "active" ingredient in a pesticide product, both to plants and animals. These chemicals can be biologically and chemically active, but are not added to the product formulation for the purpose of attacking the target pest (e.g., insect, weed, or fungus). Inerts are generally used to enhance the active ingredient, and are employed as antifoaming agents, surfactants, propellants, or a number of other uses. The U.S. Environmental Protection Agency (EPA) does not require manufacturers to disclose the inerts used in any particular pesticide product. They are considered confidential business information (CBI).
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