What type of pesticide formulation consists of a solid active ingredient impregnated with clay and ground to a fine powder?

Dusts are a type of pesticide formulation that consist of a solid active ingredient that has been mixed with an inert carrier, such as clay, and finely ground into a powder. This formulation is typically characterized by its dry, powdery texture, which allows for easy application. The particles can adhere to plant surfaces or pests, allowing for effective pest control. Dusts are particularly useful for targeting pests in areas that may be difficult to treat with liquid formulations, such as inside cracks and crevices or on rough surfaces.

Other types of formulations, like flowables and aerosols, have different physical characteristics and application methods, which do not match the description given. Flowables are liquid formulations containing suspended solids, while aerosols are pressurized products that disperse a fine mist. Wettable powders, though similar in being powders, require dilution in water before application, which distinguishes them from dusts that can be applied directly as they are.