Which statement is true about adjuvants in pesticide mixtures?

• A. They are never added by the applicator
• B. They are often required to enhance mixing or performance
• C. They must be registered with the EPA for every product
• D. They replace the active ingredient

Answer: (B)

Adjuvants modify how a pesticide behaves in the spray and on the plant, often needed to make the product mix well and work effectively. They improve mixing in the tank, help the spray wet and spread over leaf surfaces, aid on-plant penetration, and can reduce drift or wash-off. Because of these benefits, they’re commonly added to tank mixtures to boost performance when the label or experience suggests they’re needed. Adjuvants are not active ingredients themselves and don’t replace the pesticide; they’re there to support and enhance the active ingredient’s delivery and effectiveness. Also, not every product requires a separate EPA registration for each adjuvant used; many adjuvants are approved for broad use with pesticides, depending on the label.