What is the term for a chemical added to a pesticide formulation to increase effectiveness or safety?

• A. Adjuvant
• B. Fertilizer
• C. Degree Days
• D. Carbohydrate

Answer: (A)

An adjuvant is a substance added to a pesticide formulation to boost its performance or safety. It isn’t a pesticide itself, but it changes how the product behaves in the field. Adjuvants can improve coverage by lowering surface tension so the spray spreads more evenly on leaf surfaces, help droplets stick so they don’t run off, or aid penetration into plant tissues. They can also reduce drift or evaporation, making applications safer and more effective. In some cases, adjuvants improve compatibility with other tank-mixed products or help the formulation work better under varying environmental conditions.

Fertilizer, degree days, and carbohydrate don’t describe this purpose. Fertilizer provides nutrients for plants, degree days are a heat-unit measure for pest development, and carbohydrates are sugars; none refer to additives that enhance a pesticide’s performance or safety.