An active ingredient is the chemical or biological substance in a pesticide, fertilizer, or other plant product that produces its intended effect. In pesticides, the active ingredient is the component that controls the target pest, disease, or weed. All other ingredients in the formulation are considered inert ingredients, although they may improve mixing, stability, absorption, or application.
The active ingredient determines how a product works, what organisms it affects, how it should be applied, and the precautions required for safe use. Different products may contain the same active ingredient under different brand names or in different concentrations and formulations.
The active ingredient is listed on the product label, usually by its common name and concentration, making it the most reliable way to compare similar products regardless of brand.
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