Metabolic Fate of Foliarly Applied [14C]Thiabendazole in Three Growing Plants:  Wheat, Soybeans, and Sugar Beets

Following foliar application of [14C]thiabendazole to growing wheat, soybean, and sugar beet plants, samples were taken 2 h post-treatment, at immature stages, and at normal harvest. Significant levels of [14C]thiabendazole residues were found in straw and immature leaves (∼10−22 ppm), but residues...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1996-09, Vol.44 (9), p.2870-2877
Main Authors: VandenHeuvel, William J. A, Wislocki, Peter G, Sanson, Dale R, Halls, Timothy D. J, Chukwudebe, Amechi C
Format: Article
Language:English
Subjects:
APLICACION FOLIAR
APPLICATION FOLIAIRE
BENZIMIDAZOLE
BENZIMIDAZOLES
BETTERAVE SUCRIERE
Biological and medical sciences
BLE
Chemical control
Control
FOLIAR APPLICATION
FONGICIDE
Food industries
Food toxicology
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
FUNGICIDAS
FUNGICIDES
METABOLISM
METABOLISME
METABOLISMO
METABOLITE
METABOLITES
METABOLITOS
PESTICIDE
PESTICIDES
Phytopathology. Animal pests. Plant and forest protection
PLAGUICIDAS
REMOLACHA AZUCARERA
RESIDU
RESIDUES
RESIDUOS
SOJA
SOYBEANS
SUGAR BEET
TRIGO
WHEATS
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Summary:Following foliar application of [14C]thiabendazole to growing wheat, soybean, and sugar beet plants, samples were taken 2 h post-treatment, at immature stages, and at normal harvest. Significant levels of [14C]thiabendazole residues were found in straw and immature leaves (∼10−22 ppm), but residues were far lower in wheat grain, soybean seeds, and sugar beet roots (∼0.12−0.88 ppm), demonstrating very limited translocation of thiabendazole-derived residues. Thiabendazole was the major component (≥91%) of the total residues in early foliage. Samples harvested at later growth stages contained increased levels of polar (aqueous-soluble) and nonextractable residues and diminished levels of organic-extractable residues. Most of the extractable radioactivity consisted of thiabendazole. The major transformation product of thiabendazole found was benzimidazole, present mainly in conjugated form. Fractionation of nonextractable residues in wheat straw demonstrated some incorporation into tissue components. Keywords: Thiabendazole; fungicide; benzimidazole; benzimidazole conjugates; residues; HPLC; GC/MS
ISSN:0021-8561
1520-5118
DOI:10.1021/jf9600871