MDARD Michigan Core Pesticide Applicator Practice Exam

What type of pesticide formulation typically requires agitation when mixed with water?

1. Liquid emulsifiable concentrates

2. Wettable powders

3. Aerosolized sprays

4. Liquid suspensions

The correct answer is: Wettable powders

Wettable powders are a type of pesticide formulation that typically requires agitation when mixed with water. This is because wettable powders are solid particles that do not dissolve in water; instead, they need to be suspended in the liquid. Agitation helps to disperse these particles evenly throughout the water, ensuring that the mix is uniform and that the pesticide can be effectively applied to the target area. When well agitated, wettable powders clump less and create a consistent suspension, which is crucial for effective application. If not adequately mixed, clumping can occur, leading to uneven distribution of the pesticide on plants or surfaces, which may reduce the effectiveness of pest control and also increase the risk of crop injury or environmental contamination. Other formulations like liquid emulsifiable concentrates and liquid suspensions also require some level of mixing, but they do not necessitate as intense or ongoing agitation like wettable powders do. Aerosolized sprays are typically ready-to-use and do not require mixing with water before application.