Which type of adjuvant increases the viscosity of spray mixtures?

Thickeners are specifically designed to increase the viscosity of spray mixtures. This property allows the pesticide solution to remain on the target surfaces longer, enhancing coverage and adherence. Higher viscosity can also reduce spray drift and improve control over the application, which is particularly important when applying pesticides in sensitive areas or windy conditions.

While surfactants improve the spreading and wetting of the pesticide on surfaces, and emulsifiers help to mix oil and water in formulations, their primary functions do not involve increasing viscosity significantly. Inert ingredients serve various roles within pesticide formulations but do not specifically enhance viscosity like thickeners do. Understanding the role of each type of adjuvant is crucial for effective pesticide application, particularly in ensuring the desired performance characteristics of the product being used.