MDARD Michigan Core Pesticide Applicator Practice Exam

What is the typical range of active ingredient concentration in a gallon of emulsifiable concentrate (EC)?

1. 0 to 10 percent

2. 10 to 25 percent

3. 25 to 75 percent

4. 75 to 100 percent

The correct answer is: 25 to 75 percent

Emulsifiable concentrates (EC) are a type of pesticide formulation that contains active ingredients dissolved in an organic solvent along with emulsifiers. The typical range of active ingredient concentration in a gallon of EC is usually between 25 to 75 percent. This concentration level offers a good balance between efficacy and the formulation's stability and usability. A lower concentration (like 0 to 10 percent) would often not provide sufficient pesticide potency for effective pest control, while concentrations approaching 100 percent may raise concerns about handling, safety, and application efficiency. Concentrations in the 10 to 25 percent range may also be too low for many applications, making the 25 to 75 percent range the most common and practical for many types of pesticides formulated as emulsifiable concentrates.