MDARD Michigan Core Pesticide Applicator Practice Exam

What type of adjuvant increases the viscosity of spray mixtures?

1. Adhering agent

2. Surfactant

3. Thickener

4. Solubilizer

The correct answer is: Thickener

The correct answer is thickener, which is designed to increase the viscosity of spray mixtures. When applied to pesticide formulations, thickeners enhance the physical properties of the liquid, allowing it to adhere better to surfaces and preventing it from running off. By increasing the viscosity, thickeners can help reduce the potential for drift during application and improve the performance of the pesticide by allowing it to stay in contact with target plants or pests longer. This interaction is crucial for maximizing the effectiveness of the pesticide application. In many cases, increased viscosity helps ensure that the product remains on the intended target sites, thereby improving overall pest control and minimizing waste or environmental impact. Thickeners can also be beneficial in reducing the amount of spray solution required, as they allow for better coverage without needing a larger volume of liquid. Other types of adjuvants serve different purposes. Adhering agents are primarily used to help pesticides stick to the target surfaces, surfactants modify the surface tension to improve spreading and penetration, and solubilizers help dissolve other ingredients in the formulation. Each of these adjuvants plays a unique role in pesticide effectiveness, but for specifically increasing viscosity, thickeners are the appropriate choice.