Illinois Pesticide Applicator Practice Test

In what order should pesticides be mixed in a tank for optimal results?

1. Liquid, Wettable Powder, Soluble Powder

2. Soluble Powder, Wettable Powder, Flowable

3. Flowable, Wettable Powder, Soluble Powder

4. Soluble Powder, Flowable, Wettable Powder

The correct answer is: Soluble Powder, Wettable Powder, Flowable

To achieve optimal mixing results when combining different types of pesticides in a tank, it is essential to follow a proper sequence. Starting with soluble powders is beneficial because they dissolve easily in water, allowing for a uniform solution. This initial step ensures that any remaining substances added later can mix effectively. Next, introducing wettable powders helps to maintain the mixture's stability. Wettable powders need to be thoroughly mixed with water to create a suspension before it can be applied effectively. By adding it after the soluble powders, you allow the wettable powders to disperse properly without clumping, which can occur if added first. Finally, flowable formulations are added last. These products are typically ready to use as they contain water and are designed to pour readily without the need for significant agitation. Adding them last prevents the heavier components from settling at the bottom and ensures they mix well with the initial components. Using this order helps minimize the likelihood of clogs in application equipment and ensures a consistent mixture, promoting effective and safe pesticide application. Therefore, beginning with soluble powders, followed by wettable powders, and concluding with flowables is the best practice.