Associate Certified Entomologist (ACE) Practice Exam

What is the main feature of suspension concentrates (SC) in pest control applications?

1. They are solids needing no mixing

2. They must be diluted and agitated before use

3. They are flammable and require special handling

4. They are encapsulated in polymers for slow release

The correct answer is: They must be diluted and agitated before use

Suspension concentrates (SC) are a type of pesticide formulation that consists of solid particles dispersed in a liquid. This formulation requires dilution with water before application to ensure an even distribution of the active ingredient and to facilitate the effectiveness of the pesticide. Proper agitation is also necessary during mixing to keep the solid particles uniformly suspended in the liquid, which prevents clumping and ensures that the pesticide can effectively target the pests when applied. This distinct characteristic sets suspension concentrates apart from other formulations. For instance, solids that require no mixing would not be classified as suspension concentrates, as these would be ready-to-use products rather than those needing further preparation. Moreover, the classification does not imply flammability or handling concerns typical of certain other formulations used in pest control, nor does it involve encapsulation for slow release, which refers to different delivery systems designed for controlled timing of the active ingredients. Thus, the necessity for dilution and agitation before use is the defining feature of suspension concentrates.