What is a potential negative effect of using wettable powders (WP)?

The potential negative effect associated with using wettable powders (WP) is that they may cause wear on application equipment. Wettable powders consist of fine particles that, when mixed with water, create a suspension. The abrasive nature of these particles can lead to increased wear and tear on application equipment, such as pumps and nozzles, as they can clog or cause erosion over time. This is particularly important to consider in pest control and agricultural applications, where maintaining equipment function is vital for efficient operation and cost management.

The other choices highlight characteristics or potential issues with wettable powders, but do not represent a critical negative effect. For example, while some formulations may dissolve quickly, causing concern in certain scenarios, this is not universally true for all wettable powders and does not characterize them as a significant issue. Similarly, while cleaning is always necessary with most pesticide application equipment, especially after using wettable powders, stating that no cleaning is required is incorrect. Lastly, not all wettable powders are odorless, as some may have a noticeable scent depending on their active ingredients or formulation.