Which adjuvant category is designed to increase the adhesion of solids to surfaces?

• A. Stickers
• B. Surfactants
• C. Emulsifiers
• D. Wetting Agents

Answer: (A)

The main idea here is adhesion of the spray to the surface. Sticker adjuvants are designed to form a sticky, sometimes film-forming layer on plant surfaces, so the pesticide particles or droplets remain attached rather than washing off with rain or irrigation. They increase retention and persistence of the product on the target surface.

Surfactants, by contrast, lower surface tension to improve wetting and spreading, helping the drop cover more area, but they don’t primarily boost how strongly the material sticks to the surface. Emulsifiers stabilize mixtures of immiscible ingredients, not adhesion to surfaces. Wetting agents are a type of surfactant focused on spreading and initial coverage, not long-term adhesion.