Pesticide Applicator Practice Test – Pass the Wisconsin Exam in 2025

The correct sequence for mixing pesticides in a tank is critical for ensuring proper solubility and effectiveness of the products. When filling the tank, starting with wettable powders before adding flowables and finally soluble powders ensures that each type of formulation is mixed thoroughly.

Wettable powders require a certain amount of agitation and water to fully dissolve and disperse. By adding wettable powders first when the tank is filled to about one-quarter to one-half full, you provide the necessary environment for these particles to dissolve effectively. Next, flowables can be added without risking clumping or settling, as they are designed to remain in suspension. Finally, adding soluble powders at this stage allows them to dissolve more efficiently in the mixture since the tank already contains water and properly mixed ingredients, facilitating easier loading into the solution.

This order of addition helps to prevent issues like clumping or sedimentation that can occur when wrong sequences are followed. In contrast, beginning with soluble powders or not incorporating the correct agitation can lead to ineffective mixing and adherence to proper formulation practices.