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Transport of the Systemic Fungicide, Benomyl, in Bean Plants. Carol A. Peterson, Postdoctoral Fellow, Department of Botany, University of Guelph, Guelph, Ontario, Canada; L. V. Edgington, Professor, Department of Botany, University of Guelph, Guelph, Ontario, Canada. Phytopathology 60:475-478. Accepted for publication 13 October 1969. DOI: 10.1094/Phyto-60-475.

Benomyl (methyl 1-[butylcarbamoyl]-2-benzimidazolecarbamate) rapidly decomposed to methyl 2-benzimidazolecarbamate (MBC) in dilute aqueous solution and within plants. Only slight breakdown of the MBC occurred in bean leaflets during the month following treatment of the plants with benomyl. Benomyl and MBC were taken up passively by the roots, transported to leaves via the xylem, and accumulated in the leaf tips and margins. When the supply to the roots was discontinued for 15 days, no MBC was detected in stems or central areas of the leaves. MBC is not phloem-mobile, although it may appear in the bark because of lateral transfer from the xylem.