Abstract: A fumigation apparatus is provided which uses mixed gas of hydrogen phosphide and methyl bromide, said mixed gas containing hydrogen phosphide at a high concentration, and which is free from the risk of ignition and safe. The apparatus, furthermore, is capable of fumigation that can completely kill noxious insects infesting green plants within a short time, exhibiting very little phytotoxicity on the plants and leaving extremely little residual fumigating agent after fumigation. Said apparatus is composed of (a) a system for purging air and hydrogen phosphide in a hydrogen phosphide path; (b) a system for hydrogen phosphide supply and transfer from a hydrogen phosphide bomb to a mixer through a humidifier; (c) a system for methyl bromide supply and transfer from a methyl bromide bomb to the mixer; and (d) a system for transferring the mixed gas from the mixer to a fumigation chamber.

Abstract: An improved method of fumigating fresh plants on which pests are parasitic. The method comprises maintaining the fresh plants in a gaseous atmosphere composed of 10 to 50 mg/liter of methyl bromide, 0.01 to 10 mg/liter of hydrogen phosphide, and 1 to 50% by volume of carbon dioxide. The method can surely kill the pests on the plants without causing phytotoxicity.