NOVELTY - Azeotropic or azeotrope-like composition (I) comprises a mixture of methyl iodide and at least one fluorocarbon/hydrofluorocarbon (A), where (I) is a gas at 30 degrees C or below.    USE - (I) is useful in a fumigant (claimed). (I) is useful as: a non-ozone depleting gaseous fumigant, which is useful in a variety of applications, in place of methyl bromide; and a drop-in replacement for gaseous methyl bromide, providing the benefits of a methyl iodide fumigant. (I) is useful as a fumigant or as a component of a fumigant for combating insects, termites, rodents, weeds, nematodes, and soil-borne diseases. (I) is useful to fumigate agricultural commodities, grain elevators, mills, ships, clothes, furniture, greenhouses, and the control of pests in buildings (structural fumigation). No biological data given.    ADVANTAGE - (A) has: a boiling point of 0-50 degrees C; an average ozone depletion potential of 0.05 or less; and a 100-year global warming potential of 1000 or less. (I) has: a boiling point of 8-14.5 degrees C; and a density of 1.5-2.4 g/cc. The fumigant composition comprising (I), has similar properties to methyl bromide, without its ozone-depleting properties. (A): is a non-toxic portion of the composition, thus reducing worker exposure to toxic materials; and enables a more uniform and easily controlled application of (I). (A): increases the overall volume of the composition; and facilitates application of the composition and increasing the time that a given volume of methyl iodide is exposed to a material to be contacted. (I) effectively serves as a drop-in replacement for gaseous methyl bromide, providing the benefits of a methyl iodide fumigant while also utilizing existing methyl bromide equipment. (I) have a very similar environmental efficacy and spectrum of activity as methyl bromide, while also exhibiting a low potential for ozone degradation.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a fumigant comprising (I); and    (2) a fumigation process comprises providing the fumigant comprising (I) and applying the fumigant to a material to be fumigated.