What is the main characteristic of fog treatment in pest management?

The main characteristic of fog treatment in pest management is that it utilizes a fine mist for application. This method allows for the even distribution of pest control chemicals in a way that can penetrate into crevices and hard-to-reach areas where pests may be harboring. The fine mist formed during fogging is effective in covering large areas quickly, making it particularly useful for treating both indoor and outdoor environments.

In contrast, other options don't align with the defining feature of fog treatments. For example, while it's true that some pest control methods might use solid forms of chemicals, fogging specifically uses a mist to maximize effectiveness and reach. The requirement for special equipment can be true, but it is not the defining characteristic of the treatment itself, as other methods may also require equipment. Additionally, fog treatment is not limited to indoor applications; it can be effectively used in outdoor settings as well, which differentiates it further from any notion of being an indoor-only treatment.