What type of pesticides do Fumigants consist of?

Fumigants are specifically designed to be gaseous compounds that are utilized for pest control. They work by penetrating the spaces where pests might reside, effectively killing them in enclosed environments, such as buildings, ships, and soil. The nature of fumigants allows them to diffuse throughout the area, ensuring that even hidden pests are targeted. This form of pesticide is particularly effective against a wide range of pests, including insects, rodents, and molds, making it a versatile option in pest management.

The other choices mention different forms of pesticides, such as liquids, solids, and powders, which do not convey the unique gaseous property of fumigants, nor do they account for the specific context in which fumigants are applied. Thus, the focus on gaseous compounds as described fits the definition and application of fumigants perfectly.