Which type of adjuvant functions as a wetting agent & spreader (i.e. psychically altering the surface tension of the droplets?

Which type of adjuvant functions as a wetting agent & spreader (i.e. psychically altering the surface tension of the droplets?

• A. Buffer
• B. Extender
• C. Surfactant
• D. Emulsifier

Answer: (C)

Wetting and spreading of pesticide droplets depend on lowering the surface tension between the spray and the leaf surface. A surfactant does exactly that: it reduces surface tension so droplets spread out smoothly rather than bead up, giving better coverage. That makes it the best choice for acting as a wetting agent and spreader. A buffer adjusts pH for stability but doesn’t alter surface tension. An extender serves as a diluent to increase spray volume without changing wetting properties. An emulsifier helps mix oil and water to prevent separation, but its main role isn’t to improve wetting or spreading on leaves. In short, the surfactant is the one designed to improve wetting and spreading by altering surface tension.

Wetting and spreading of pesticide droplets depend on lowering the surface tension between the spray and the leaf surface. A surfactant does exactly that: it reduces surface tension so droplets spread out smoothly rather than bead up, giving better coverage. That makes it the best choice for acting as a wetting agent and spreader. A buffer adjusts pH for stability but doesn’t alter surface tension. An extender serves as a diluent to increase spray volume without changing wetting properties. An emulsifier helps mix oil and water to prevent separation, but its main role isn’t to improve wetting or spreading on leaves. In short, the surfactant is the one designed to improve wetting and spreading by altering surface tension.