Methyl iodide was evaluated as a soil fumigant as a potential replacement for the widely used soil fumigant methyl bromide. In container trials, methyl iodide was signiÐcantly more e †ective than methyl bromide against the plant parasitic nematodes Meloidogyne incognita, Heterodera schachtii and T ylenchulus semipenetrans and the plant pathogenic fungus Rhizoctonia solani. In small Ðeld plots, soil populations of root-knot nematodes were no longer detected after methyl iodide fumigation at an application rate of 112 kg ha~1. However, after growing a susceptible lima bean host for two months, substantial root-knot galling occurred, while Rhizobium nodulation was absent. At 168 kg ha~1 of methyl iodide, root-knot galling was reduced to less than 1%, and no Pythium propagules were recovered on selective detection media. These efficacy data support the conclusion that methyl iodide is a likely candidate for replacing methyl bromide as a soil fumigant. 1998 SCI. ( Pestic. Sci., 52, 58È62, 1998
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