What are the three types of fumigation?

What are the three types of fumigation? Three main types of fumigation are commonly referenced in pest control. First is structural or whole-structure fumigation, where an entire building is sealed with tarps or tents and filled with gas like sulfuryl fluoride Vikane to kill drywood termites, bed bugs, and other pests deep inside wood and walls, usually lasting 24 to 72 hours. Second is commodity or product fumigation, where stored goods like grains, nuts, spices, and timber are fumigated in sealed containers, silos, or chambers with phosphine or methyl bromide to kill insects, larvae, and fungi that infest food stocks. Third is soil fumigation, where soil is treated with fumigants like metam sodium, chloropicrin, or 1,3-dichloropropene before planting crops to kill nematodes, weeds, fungi, and soil insects. Some classifications list chamber fumigation for furniture and soil fumigation separately, or gas, solid, and liquid fumigation by formulation, but structural, commodity, and soil are the most widely taught three types.