What are wettable or soluble powders (WP or SP) primarily used for?

Wettable or soluble powders (WP or SP) are primarily designed to be mixed with water, allowing them to dissolve and form solutions that can have a high concentration of pesticides. This is particularly beneficial because it enables more effective applications, leading to better absorption and efficacy when applied to plants or surfaces. The ability to dissolve means that they can easily spread over the target area, ensuring that the pesticide is uniformly distributed.

In contrast, immediate application without preparation does not accurately describe the nature of WP or SP, as they typically require mixing with water before use. While diluting with other chemicals could alter the effectiveness, it is not the primary use of these powders, which focus on forming strong aqueous solutions. Lastly, while WP or SP can provide a solid form, the primary characteristic of these products is their ability to dissolve in water rather than remaining undissolved. Thus, the option emphasizing the formation of solutions with high pesticide concentration accurately captures the main utility of wettable or soluble powders.