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Translocation of Benomyl in Creeping Bentgrass. W. A. Meyer, Graduate Fellow, Department of Plant Pathology, University of Illinois, Urbana 61801; J. F. Nicholson(2), and J. B. Sinclair(3). (2)(3)Research Assistant, and Professor, respectively, Department of Plant Pathology, University of Illinois, Urbana 61801. Phytopathology 61:1198-1200. Accepted for publication 14 May 1971. DOI: 10.1094/Phyto-61-1198.

Root uptake and translocation of benomyl and its breakdown product, MBC (methyl-2-benzimidazole carbamate), were studied in Toronto creeping bentgrass (Agrostris palustris) stolons having either one or two root systems. The roots of stolons with a single root system were either nontreated (control) or treated with 5, 12.5, or 25 mg/liter benomyl for 24, 48, or 96 hr. Bioassay and thin-layer chromatography showed presence of fungistatic compounds throughout all tissues of stolons with a single root system. This showed translocation of benomyl upward in the transpiration stream to the growing point. When benomyl at 100, 500, or 1,000 mg/liter was sprayed on leaves, upward translocation was found but no downward translocation. Using a double-cup technique, a second and separate root system was established five nodes from the first. When this system was exposed to either 25, 100, 500, or 1,000 mg/liter benomyl for 4 days, the fungistats were found to be translocated back into the crown of the first root system. This indicated “lateral” movement of the fungistats.