Structural Pest Control Applicator Practice Exam

Which pesticide formulation usually requires thorough agitation before use?

1. Dust

2. Fumigant

3. Emulsifiable concentrate

4. Aerosol

The correct answer is: Emulsifiable concentrate

Emulsifiable concentrates are formulations that contain active ingredients dissolved in an organic solvent and emulsifiers to allow them to mix with water. Because they are concentrated solutions, it is crucial to achieve a uniform mixture before application. Without thorough agitation, the active ingredient can settle or separate, leading to an ineffective application and inconsistent pest control. The necessity for agitation is less critical for other formulations like dust or aerosols, which are designed to remain in a stable state without the need for mixing with a liquid. Fumigants, while requiring careful handling, do not require agitation in the same way as emulsifiable concentrates. Therefore, thorough agitation is a key step in preparing emulsifiable concentrates for effective use.