What is an adjuvant?

• A. A chemical additive that increases the effectiveness of the active ingredient and makes application easier
• B. A pesticide with no active ingredient
• C. A method of application
• D. A target pest

Answer: (A)

An adjuvant is a chemical additive added to a pesticide spray mix to boost how well the active ingredient works and to make the application easier. It isn’t a pesticide itself; it enhances delivery, coverage, and persistence of the active ingredient. For example, surfactants lower surface tension to help the spray spread on leaf surfaces, spreader-stickers help the product stay on after rainfall, and drift-reducing agents keep droplets from moving off-target. Because of this role, the description that captures an adjuvant best is that it increases the effectiveness of the active ingredient and makes application easier. It’s not a pesticide without an active ingredient, not a method of application, and not a target pest.