Associate Certified Entomologist (ACE) Practice Exam

What is the primary challenge associated with wettable powders (WP)?

1. They do not dissolve in water well

2. They require constant agitation and may damage equipment

3. They have a short shelf life and degrade quickly

4. They are ineffective against mature insects

The correct answer is: They require constant agitation and may damage equipment

The primary challenge associated with wettable powders (WP) is that they require constant agitation during application to ensure even distribution of the powder throughout the water. This characteristic can lead to issues with equipment as the constant stirring or shaking can potentially damage pumps and other components. Additionally, if the wettable powder is not kept well agitated, it can settle at the bottom of the tank, leading to inconsistencies in the application rate and potentially reducing the effectiveness of the treatment. While the other options touch on issues related to wettable powders, they do not capture the fundamental operational challenge that requires close attention and management when using these products in pest control. For instance, while wettable powders may not dissolve entirely in water, they can still create a suspension that allows for effective application when agitated properly. Similarly, while some types of formulations may have limited shelf lives, wettable powders often have good stability when stored correctly. Lastly, wettable powders can be highly effective against various life stages of insects if used appropriately, including mature insects.