What type of pesticide formulation results in a milky emulsion when mixed with water?

The correct choice is emulsifiable concentrate, as this type of pesticide formulation is specifically designed to mix with water and create a milky emulsion. It contains active ingredients that are dissolved in a liquid, often combined with emulsifying agents that facilitate the mixing process. When the emulsifiable concentrate is added to water, it forms an emulsion—a stable mixture of oil and water that appears milky.

This characteristic is significant because it ensures that the pesticide remains evenly distributed throughout the mixture, allowing for effective application. Other choices like emulsion (which may refer to the resultant mixture but not the formulation itself), dust (which is a dry formulation), and granule (larger, solid particles) do not produce a milky emulsion when mixed with water. Therefore, understanding the properties of emulsifiable concentrates highlights their role in pest management and effective application methods.