MDARD Michigan Core Pesticide Applicator Practice Exam

What is a key characteristic of soluble powders compared to wettable powders?

1. They have lower active ingredient percentages

2. They do not dissolve in water

3. They form a true solution when mixed with water

4. They are typically more hazardous to inhale

The correct answer is: They form a true solution when mixed with water

A key characteristic of soluble powders is that they form a true solution when mixed with water. This means that when soluble powders are added to water, they completely dissolve, creating a homogeneous mixture where the active ingredients are distributed evenly throughout the liquid. This property makes them particularly effective for certain applications where even distribution of the pesticide is critical. In contrast, wettable powders do not dissolve in water but can be suspended. They require thorough mixing to achieve a uniform distribution in the spray solution, which can lead to issues if not properly agitated before application. The other characteristics of soluble powders, such as having active ingredient percentages or inhalation hazards, may vary and do not define their primary distinguishing feature compared to wettable powders. The ability to create a true solution significantly impacts the effectiveness and usability of the product in pest control practices.