What characterizes an emulsifiable concentrate (EC) insecticide?

An emulsifiable concentrate (EC) insecticide is characterized by its ability to form a stable emulsion when mixed with water. This formulation typically contains both active and inert ingredients and is designed to mix readily with water, making option B accurate as it indicates that emulsifiable concentrates require minimal agitation to achieve and maintain their emulsion when diluted.

Emulsifiable concentrates are formulated to provide effective dispersion in water, facilitating accurate application and ensuring the active ingredients are evenly distributed. Therefore, significant agitation is generally unnecessary once the concentrate is mixed with water, allowing for easier handling in both mixing and application processes.

The other options do not fit the characteristics of emulsifiable concentrates appropriately. For instance, an emulsifiable concentrate does mix well with water, contrary to the first option, and therefore cannot be said to not mix well. While many EC formulations have certain safety warnings for toxic effects, they are not universally characterized by high toxicity to aquatic life, so the third option is not definitive for this type of insecticide. Finally, emulsifiable concentrates contain both liquid and solid components, making the last option inaccurate.