According to the relevant requirements of CIQ, all flowers and fruits when export or import should be fumigated to kill pests. In view of the timeliness and good effect, normally we use methyl bromide to fumigate.
Due to destruction of methyl bromide on the atmospheric ozone layer, its use range will gradually restricted.
Because of CO2 or nitrogen have a certain effect on preservation of fresh products, they can promote the the frequency of insects valve opening and closing. Thus the poison gas is easy into the insects faster. As the lower costs of CO2, it has good development prospects to preserve the fresh goods such as flowers.