Illinois Pesticide Applicator Practice Test

What is a common issue associated with the use of Wettable Powders (WP)?

1. They enhance pesticide effectiveness

2. They wear out pumps and nozzles

3. They are easier to apply

4. They are less toxic to plants

The correct answer is: They wear out pumps and nozzles

Wettable Powders (WP) are formulated to be mixed with water and create a suspension for application. One common issue associated with these products is that they can cause wear and tear on equipment such as pumps and nozzles. This is due to the abrasive nature of the powder particles, which can lead to increased friction and potential damage over time to the spraying equipment. Proper maintenance and occasional replacement of parts may be necessary to mitigate this issue when using Wettable Powders. In contrast, the other options present attributes that do not typically align with Wettable Powders. For example, while effectiveness can vary based on many factors, it is not accurate to say that WP enhances effectiveness directly; the formulation's performance depends more on application methods and conditions. Applying WP can also be more challenging than liquid formulations, as they often require thorough mixing and can settle if not agitated properly. Lastly, the toxicity of Wettable Powders is not inherently less than other formulations; in fact, they can sometimes be equally or more toxic to plants if not used following label directions.