What type of formulation is described as a water soluble pesticide dispersed in an oil carrier?

The correct choice describes invert emulsions, which are formulations where water-soluble pesticides are dispersed in an oil carrier. Invert emulsions are characterized by having the water phase internalized within the oil phase, making the formulation stable and effective for specific applications. This type of formulation allows for better adherence to plant surfaces and can provide extended control of pests due to the slower release of the active ingredient.

This formulation is beneficial for certain pest control scenarios, especially when dealing with wet conditions that might wash away other types of pesticides. The oil component helps to improve the spreadability and penetration of the pesticide on the target surfaces, making it particularly useful in agricultural settings.

In contrast, the other options refer to different types of pesticide formulations that do not fit the description. Microencapsulated formulations involve active ingredients encapsulated within a polymer, providing a controlled release, whereas water-dispersible granules are solid granules that dissolve in water to form a spray solution. Fumigants, on the other hand, are gaseous pesticides designed to penetrate and control pests in soil or confined spaces, rather than a combination of water and oil solvents.