Iowa Pesticide Applicator Practice Exam

Which type of pesticide formulation is categorized as a wettable powder?

1. Soluble powder

2. Water-dispersible granule

3. Ready-to-use

4. Wettable powder

The correct answer is: Wettable powder

Wettable powders are a specific type of pesticide formulation that consist of finely ground solid particles that can be mixed with water to create a suspension. When added to water, these powders can readily disperse and create a liquid solution that can be applied to plants or surfaces, where they adhere effectively to the target area. The properties of wettable powders allow them to be used in various application methods, including spraying. In contrast, the other options refer to different types of pesticide formulations with distinct characteristics. Soluble powders dissolve completely in water, forming a solution rather than a suspension. Water-dispersible granules, while similar in some ways, are typically larger granules that break down in water and do not require as much agitation for uniform distribution. Ready-to-use formulations come pre-mixed and do not require any water or mixing to be applied, which limits their application versatility compared to wettable powders. Understanding these differences helps in selecting the right formulation for specific pesticide application needs.