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Systemic Uptake of 14C-labeled 2-(4-thiazolyl) benzimidazole in Soybean. L. E. Gray, Research Plant Pathologist, ARS, USDA, Soybean Investigations, University of Illinois, Urbana 61801; J. B. Sinclair, Professor, Department of Plant Pathology, University of Illinois, Urbana 61801. Phytopathology 61:523-525. Accepted for publication 26 November 1970. DOI: 10.1094/Phyto-61-523.

Direct evidence of the uptake and translocation of TBZ [2-(4-thiazolyl) benzimidazole] was obtained using 14carbon-labeled TBZ and nonlabeled TBZ. Both compounds were absorbed by roots of soybean seedlings, and appeared to move unaltered into all aboveground tissues. The accumulation of 14C-TBZ increased in epicotyl and root tissues with increase in exposure time, while radioactivity in hypocotyl tissues was not affected by exposure time. TBZ was fungitoxic for Cephalosporium gregatum both in vitro and in vivo. TBZ, used as a soil drench in clay pots (25 ml of 200 µg/g in 750 g soil), restricted the development of internal browning in soybeans which were wound-inoculated with C. gregatum when plants were 8 weeks old. The fungus could not be reisolated from treated plants.

Additional keywords: brown stem rot, fungicide.