Which problem can arise from not agitating a wettable powder in the sprayer?

Not agitating a wettable powder in the sprayer can lead to settling at the bottom of the tank, which is primarily due to the physical properties of wettable powders. These powders contain particles that can be heavier than the liquid they are mixed with. If they are not properly agitated, the heavier particles will sink, resulting in an uneven distribution of the active ingredients throughout the solution. This settling can lead to a situation where the operator may apply a solution that is too concentrated in certain areas, resulting in insufficient coverage or ineffective treatment where the powder isn't held in suspension in the liquid.

Maintaining proper agitation ensures that the wettable powder is evenly mixed with the liquid, allowing for consistent and effective application. This is a critical aspect to consider in pesticide application, as the uniformity of the mixture directly affects the efficacy of the treatment and the safety of the application.