MDARD Michigan Core Pesticide Applicator Practice Exam

Which formulation is typically best for minimizing inhalation risk during handling?

1. Powder

2. Wettable powder

3. Water-dispersible granule (WDG)

4. Liquid concentrate

The correct answer is: Water-dispersible granule (WDG)

The water-dispersible granule (WDG) formulation is often considered the best choice for minimizing inhalation risk during handling due to its physical properties. WDGs are granulated formulations that dissolve in water, forming a solution before application. This process helps to significantly reduce dust generation compared to dry formulations such as powders or wettable powders, which can easily become airborne when handled or mixed. The likelihood of inhalation exposure is lowered because the granules are less likely to disperse into the air compared to fine powders. As a result, WDGs offer an effective means of reducing worker exposure to respiratory risks while still delivering the active ingredient in a liquid form for application. In contrast, powders and wettable powders can create fine particles that are more easily inhaled, and liquid concentrates, while less dusty, may require additional water and mixing processes that could also result in aerosolization if not handled properly. Therefore, WDGs are designed with safety and efficacy in mind, making them preferable for applications where minimizing inhalation risk is a priority.