Surfactants or adjuvants are used in pesticide applications for what purpose?

• A. To replace the active ingredient
• B. To increase fragrance
• C. To improve wetting, spreading, adhesion, or penetration, and only if labeled
• D. To neutralize the pesticide

Answer: (C)

Surfactants and adjuvants are used to optimize how the spray interacts with plant surfaces and pests, making the pesticide more effective. They lower surface tension so droplets spread out (wetting) on leaves rather than bead up, improve adhesion so the spray stays on rather than running off, and can help the active ingredient penetrate the plant cuticle or the pest’s body when appropriate. This enhancement happens only when the product label allows it, since some adjuvants can cause phytotoxicity, drift, or compatibility issues with other tank-mix components. They don’t replace the active ingredient, don’t add fragrance, and don’t neutralize the pesticide.