Associate Certified Entomologist (ACE) Practice Exam

Which formulation requires frequent agitation due to its composition?

1. Ready-to-use sprays

2. Microencapsulated formulations

3. Soluble powders

4. Granules

The correct answer is: Microencapsulated formulations

Microencapsulated formulations are designed with tiny capsules that contain active ingredients. This unique composition means that the pesticides are slowly released over time, which can improve their longevity and efficacy. However, because the active ingredient and the coating can separate or settle over time, frequent agitation is necessary to ensure that the microcapsules remain evenly dispersed and that the product is applied effectively. Without proper agitation, the application may deliver a concentrated dose of active ingredients that can lead to ineffective treatment or damage to the target area. Other formulations, such as ready-to-use sprays, soluble powders, and granules have different physical properties that do not necessitate the same level of agitation. Ready-to-use sprays are designed for immediate application and are typically stable without requiring mixing. Soluble powders dissolve in water, allowing for straightforward application without the need for continuous agitation, as long as the solution is mixed initially. Granules, being solid particles, do not require agitation as they are often applied directly to the soil or foliage without needing to be mixed continuously in a solution.