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Translocation of 2-(4-Thiazolyl) Benzimidazole in Maturing Cotton Plants. Manmohan S. Chatrath, Postdoctoral Fellow, International Atomic Energy Agency, Vienna, Austria, Present address of senior author: Nuclear Research Laboratory, Indian Agricultural Research Institute, New Delhi, India; Stuart D. Lyda(2), and Andre Lauchli(3). (2)(3)Associate Professor and Assistant Professor, Department of Plant Sciences, Texas A&M University, College Station, Texas 77843, (3)Present address: Fachbereich Biologie (10) der Technischen Hochschule Darmstadt, Germany. Phytopathology 62:1410-1414. Accepted for publication 16 June 1972. DOI: 10.1094/Phyto-62-1410.

Evidence of upward translocation of Thiabendazole [2-(4-Thiazolyl)benzimidazole] to morphologically different parts of maturing cotton plants was obtained when the fungicide was applied by a stem puncture method. Recovery of Thiabendazole was approximately 90% of the quantity applied to plant tissue dried at 80-85 C and extracted with methanolic HCl. Ten days after application, the fungicide was identified chemically and quantitatively determined in the stem, in young leaves at the top of the plant, and in growing bolls. No fungicide was detectable in the lower, old leaves and in roots. Thiabendazole uniformly labeled in the benzene ring with 14C and injected into the lower stem translocated to the upper stem, leaves, and bolls of maturing cotton plants. Radioactivity was detected in boll walls and ovules of the bolls present at the time of application, but it was not detectable in those formed after application. Radioactivity was detectable in both young and old leaves.

Additional keywords: systemic fungicides, spectrophotometry, thin-layer chromatography, liquid scintillation counting, radioautography.