Which type of adjuvant increases the adhesion of solid particles to target surfaces?

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

Answer: (A)

When solid pesticide particles must stay attached to a surface, the key function is adhesion—keeping those particles on the target rather than washing off. Stickers are designed to form a sticky film on leaves or other surfaces, which holds the solid particles in place and helps resist rain, irrigation, or wind. This makes them the best choice for improving adhesion of solids to the target surface.

Surfactants and wetting agents work by reducing surface tension to improve how liquids wet and spread over a surface, which helps coverage of liquid formulations but not the retention of solid particles. Emulsifiers mix immiscible liquids within a formulation and don’t focus on sticking solids to surfaces.