What is a key feature of wettable powders in pesticide use?

A key feature of wettable powders in pesticide use is that they require some form of wetting or dilution before application. These powders contain active ingredients that are formulated to remain suspended in water, allowing for effective dispersal when mixed properly. When water is added, the wettable powder forms a suspension that can be applied to surfaces to control pests. This characteristic is essential for their functionality, as it ensures that the pesticide effectively adheres to the insects and surfaces being treated.

In contrast, true solutions do not apply to wettable powders, since they involve complete dissolution in a solvent, which is not how wettable powders operate. Additionally, these powders typically have a residual activity that can be longer lasting, depending on their specific formulation, so the statement regarding low residual activity does not accurately reflect their characteristics. Lastly, wettable powders always require mixing with water prior to application, making it necessary for users to prepare the solution correctly to ensure efficacy.