What describes dust formulations (D)?

Dust formulations are characterized primarily by their low percentage of active ingredient, typically in the range of 1-10%, and they are designed to be applied in a dry manner. This allows them to adhere to surfaces effectively and work on pests by contact as they move through the treated area. The dry application is advantageous in particular situations where moisture could activate other types of formulations or affect their efficacy.

Dust formulations are usually composed of finely ground particles that float in the air during application, allowing for targeted placement in cracks, crevices, and other hard-to-reach areas where pests may hide. The low level of active ingredients contributes to the way they function, ensuring that the pest will encounter the formulation during their movement but also allowing for more extended periods of effectiveness without the need for frequent reapplication.

In contrast, the other descriptions do not accurately reflect characteristics of dust formulations. For example, suggesting that they require emulsifiers describes liquid formulations, while characterizing them as having larger and heavier particles than granules is misleading since granules are generally larger-sized particles compared to dusts. Thus, the understanding that dust formulations are dry applications with a low concentration of active ingredients is essential for correct identification and application in pest management.