In what scenario would it be most important to use an agitator during spraying operations?

Using an agitator during spraying operations is crucial when spraying wettable powders. These powders are typically not soluble in water and need to be kept in suspension to ensure an even distribution of the active ingredients throughout the mixture. An agitator helps to consistently mix the solution, preventing the wettable powders from settling at the bottom of the tank. This is essential for achieving the effectiveness of the pesticide, as well-mixed solutions result in more uniform application and better pest control.

In contrast, liquid fertilizer formulations and emulsifiable concentrates do not require the same level of agitation since they are either already in a solution or are designed to mix well with water without settling. While agitation can still aid in these scenarios, particularly for keeping the mixture homogeneous, it is not as critical as when dealing with wettable powders. Similarly, when applying herbicides, the need for agitation varies based on the formulation. However, for wettable powders, the necessity for consistent mixing makes it the clear choice.