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Growers and marketers will have to start thinking seriously about replacements for the fumigant methyl bromide. Like chlorofluorocarbons and halons, methyl bromide is considered responsible for some depletion of the ozone layer.

By international agreement its use should be reduced to 50 per cent of 1991 levels in the next seven years. It will be phased out completely by the year 2010.

According to an article in the latest issue of Stored Grain Australia, there is no one alternative fumigant. Users are urged to consider integrated commodity or pest management systems. Of particular interest to grain growers are the naturally occurring isothiocyanates as soil fumigants. Ground Cover has previously reported the possibilities of rotational cropping of brassicas (such as canola, mustard and fodder rape) that are natural producers of isothiocyanates