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Inhibition of the Multiplication of Tobacco Mosaic Virus by Methyl Benzimidazol-2-yl Carbamate

Biochemistry Section National Vegetable Research Station Wellesbourne Warwick CV35 9EF

Methyl benzimidazol-2-yl carbamate (MBC, carbendazim) is the fungitoxic principle of the systemic fungicide benomyl. It reduces the severity of symptoms produced by tobacco mosaic virus infection of tobacco plants (Tomlinson et al. 1976). Measurements of the accumulation of TMV RNA in MBC-treated and control plants showed that MBC treatment significantly reduced the accumulation of virus, by 20% in lower leaves and by up to 90% in upper leaves. No phytotoxic effects of MBC were observed at the concentrations effective against virus multiplication. Possible modes of action of MBC are discussed.

Received 28 September 1977; accepted 11 November 1977.