Which is a potential drawback of Wettable Powders in sprayers?

• A. They wear out pumps and nozzles
• B. They leave a visible residue on leaves
• C. They are always safe for operators
• D. They have no drift potential

Answer: (B)

Wettable powders disperse as fine solid particles in water, so a common drawback when they’re sprayed is leaving a visible residue on the leaves. Because not all particles dissolve, some settle onto leaf surfaces as the spray dries, creating a powdery film. This residue can be unsightly and may affect crop appearance or light interception if it coats the foliage heavily. To manage it, keep the spray suspension well agitated and apply with settings that promote thorough wetting rather than dusting. Other statements aren’t accurate: powders aren’t guaranteed to wear out pumps and nozzles, they can pose dust-related risks to operators, and there can be drift under certain conditions, so claiming no drift potential isn’t correct.