Texas Pesticide Applicator Practice Exam

What type of pesticide formulations must be diluted before they can be applied?

1. Granular formulations

2. Aerosol sprays

3. Wettable powders and emulsifiable concentrates

4. Ready-to-use solutions

The correct answer is: Wettable powders and emulsifiable concentrates

Wettable powders and emulsifiable concentrates are pesticide formulations that require dilution before application. This is necessary because these products are designed to be mixed with water to create a liquid solution that can be effectively applied to plants, surfaces, or areas needing treatment. When these formulations are diluted, they become more manageable during application and can distribute evenly over the targeted areas. The need for dilution is essential for ensuring that the pesticide is applied at the correct concentration for effective pest control. If these formulations were used undiluted, the active ingredient could be too concentrated for safe or effective application, potentially leading to phytotoxicity (harm to plants) or other unintended consequences. Other types of formulations, such as granular formulations, are designed to be used as is without dilution and typically rely on moisture or irrigation to activate their pesticides in the soil. Aerosol sprays are also ready to use without requiring any mixing with water. Ready-to-use solutions are calibrated for direct application out of the container. Each of these formulations has its specific application method suited to its formulation type, making it essential to follow proper instructions for each type.