Which dry formulation is available in several forms, including granular and gel?

Baits are a specialized type of formulation used in pest control that can come in various forms, including granular and gel. These formulations are designed to attract pests to a toxic substance that they consume, which then helps control pest populations. The versatility of baits allows them to be effective in different settings and for various types of pests, improving their usability in pest management strategies.

Insecticides can be found in different formulations, but they typically refer to chemical agents designed to kill insects rather than the bait designs specifically made to attract pests. Dusts and powders are usually forms of pesticide that do not retain the same baiting characteristics; they are more about the application method and are often used for residual control rather than as an attractant. Hence, the ability of baits to exist in both granular and gel forms, which serve as effective attractants, makes them the correct answer in this context.