Which type of pesticide is specifically designed for application in gaseous form?

Fumigants are a unique category of pesticides specifically formulated for application in a gaseous state. This distinct form allows them to penetrate various materials and environments, making them especially effective for controlling pests in enclosed spaces such as soil, stored products, and structures. The gaseous nature of fumigants enables them to reach areas that might be difficult for other formulations to access, such as cracks, crevices, and voids, ensuring a more comprehensive pest management solution.

This effectiveness is particularly important in applications where thorough pest eradication is needed, such as in agricultural settings or when dealing with invasive species. By contrast, the other types of pesticides mentioned are not designed to be used in a gaseous form and have different mechanisms of action and application methods.