Which formulation is characterized by a low application volume due to a high concentration of active ingredient?

The correct choice is ultra-low-volume concentrates (ULV) because this formulation is specifically designed to contain a high concentration of active ingredients, which allows for effective pest control while using very little product. ULV formulations are typically applied in small volumes, making them ideal for situations where the target organisms are accessible and can be effectively treated with minimal liquid. This means that applicators can achieve the desired efficacy without introducing excessive amounts of chemical into the environment.

Other formulations, such as water-soluble powders, suspension concentrates, and granular formulations, typically require larger application volumes to ensure that the active ingredients are adequately delivered and absorbed by the target pests. In contrast, ULV products are structured to maximize potency while minimizing the volume needed for application, thus promoting efficiency in pest management practices.