Dazomet is a granular soil fumigant, which reacts with water to produce methyl isothio-cyanate (MITC) gas. Dazomet is typically used as a pre-planting treatment to control soil fungi, insects and nematodes and germinating weed seeds. Application of dazomet is often followed by irrigation to ensure that there is adequate water for the dazomet to react, and to seal the soil surface to maximise the exposure time of soil organisms to MITC. Alternatively, the soil surface may be sealed with plastic sheeting or by rolling the site with a heavy roller, in order to trap the MITC within the soil profile and prevent the soil drying out during treatment.
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