What is the main characteristic of emulsifiable concentrates (EC/E)?

Emulsifiable concentrates (EC/E) are formulations that typically contain a significant concentration of active ingredients, usually ranging from 25% to 75%. This characteristic is instrumental in their purpose as they deliver a potent dose of pesticides. The inclusion of emulsifiers is crucial because it allows these concentrates to mix well with water, creating a stable emulsion when diluted. This emulsion can then be effectively applied to pests or plants.

By focusing on the correct answer, it highlights the importance of understanding the chemistry behind pesticide formulations. It also underscores the role that emulsifiers play in ensuring that the active ingredients are bioavailable and can effectively target pests when applied.

Other choices do not accurately represent the defining features of emulsifiable concentrates. While some forms can be soluble in water, EC/E specifically require emulsifiers to assist with emulsification in water rather than being "highly soluble." The assertion that they are "completely mixed before use" does not specifically address their unique formulation characteristics, as emulsification is a process that occurs during mixing with water. Lastly, stating that they "have no active ingredients" fundamentally misunderstands the very purpose of these products, which are designed to contain and deliver active pesticide ingredients effectively.