Which of the following is NOT a fumigant?

Granular bait does not function as a fumigant because it is typically used as a form of bait treatment, targeting specific pests through ingestion rather than vaporization. Fumigants, like aluminum phosphide and sulfuryl fluoride, work by releasing gas that penetrates materials or structures, effectively killing pests in enclosed spaces. Aluminum phosphide releases phosphine gas when it comes into contact with moisture, while sulfuryl fluoride is a gaseous compound used to eliminate various wood-destroying organisms.

The definition and function of fumigants highlight the specific method by which they operate compared to granular baits, which are applied physically to affected areas and require the pest to consume them for effectiveness. This understanding helps clarify why granular bait stands out as NOT being a fumigant.