What is the primary characteristic of fumigants among rodenticides?

Fumigants are primarily characterized by their gaseous form, which allows them to penetrate areas where burrowing animals, such as rodents, may reside. This property makes them especially effective for pest control in confined spaces, such as burrows or storage areas, where solid or liquid forms of rodenticides might not reach.

Fumigants work by dispersing as gases that can infiltrate small openings and crevices, ensuring that they come into contact with the target pests effectively. This method of application is distinct from solid or liquid rodenticides that are typically mixed with bait or applied directly to areas of rodent activity. Utilizing a gaseous form allows for a more comprehensive coverage of the affected area, thereby improving the effectiveness of the pest control strategy.