Which statement is true about wettable powders?

• A. They are abrasive to spray nozzles
• B. They are never abrasive
• C. They always dissolve in water
• D. They form emulsions

Answer: (A)

Wettable powders are dry pesticide formulations that must be dispersed in water to spray. Because they consist of solid particles, the product forms a suspension rather than a true solution, and those particles can interact with spray hardware as the liquid is forced through nozzle orifices. The solid particles can be abrasive, especially if they are coarse or not fully dispersed, causing wear on nozzle interiors and tips and sometimes leading to clogging or irregular spray patterns. This is why abrasive wear is a notable concern with WP products and why proper mixing, agitation, and nozzle maintenance are important when using them.

The remaining statements don’t fit because wettable powders do not reliably dissolve in water; they typically remain suspended rather than forming a true solution. They also do not form emulsions, which are mixtures of immiscible liquids; WP suspensions involve solid particles, not liquid droplets dispersed in another liquid.