Pesticide Applicator Training General Standards SP39-W Practice Test

Which spray modifiers improve pesticide adhesion to the treated surface?

Surfactants Stickers Penetrants Drift Reduction

Correct Answer:

Stickers

Explanation:

Adhesion to the treated surface is improved by film-forming modifiers known as stickers. Stickers create a thin, tacky film on the surface that helps the pesticide residue stick rather than run off with rain, irrigation, or wind. This keeps more of the product on the target long enough to work. Surfactants, which reduce surface tension to improve wetting and spreading, help the spray cover the surface better but don’t specifically enhance how well the residue clings to the surface over time. Penetrants aid the product’s movement into plant tissues rather than helping it stay on the surface. Drift reduction modifies how droplets behave in the air to minimize off-target movement, not adhesion to the surface.

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