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Thiencarbazone-Methyl Efficacy, Absorption, Translocation, and Metabolism in Vining Weed Species

Published online by Cambridge University Press:  20 January 2017

Willeke Leonie ,
Hansjörg Krähmer ,
Hans-Joachim Santel ,
Wilhelm Claupein  and
Roland Gerhards
Willeke Leonie
Affiliation:
Institute of Phytomedicine, Department of Weed Science, University of Hohenheim, Stuttgart, Germany
Hansjörg Krähmer
Affiliation:
Bayer CropScience; Industrial Park, Frankfurt am Main, Germany
Hans-Joachim Santel
Affiliation:
Bayer CropScience; Industrial Park, Frankfurt am Main, Germany
Wilhelm Claupein
Affiliation:
Institute of Crop Sciences, University of Hohenheim, Stuttgart, Germany
Roland Gerhards*
Affiliation:
Institute of Phytomedicine, Department of Weed Science, University of Hohenheim, Stuttgart, Germany
*
Corresponding author's E-mail: gerhards@uni-hohenheim.de
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Abstract

The efficacy, absorption, translocation, and metabolism of thiencarbazone-methyl (TCM) in hedge bindweed, field bindweed, ivyleaf morningglory, tall morningglory, and wild buckwheat were evaluated in greenhouse experiments and field trials. Forty-eight hours after foliar microapplication, 14C-TCM absorption was highest in ivyleaf morningglory (60%), followed by field bindweed (50%), wild buckwheat (35%), tall morningglory (17%), and hedge bindweed (9%). In all species, 14C-TCM was translocated systemically. By 24 h after application, 14C-TCM was detected in all parts of the plants. The translocation pattern is species-specific, with more translocation in tall morningglory and wild buckwheat. In all vining weeds 14C-TCM was almost not metabolized whereas corn metabolized almost all 14C-TCM 48 h after application. The efficacy of TCM was analyzed using dose–response curves. Wild buckwheat had the lowest value for the dose at which 50% of the activity occurs (2.1 g ai ha−1 TCM), followed by hedge bindweed and ivyleaf morningglory. Field studies confirmed the high control of wild buckwheat with TCM. Even at the lowest tested concentration of TCM, wild buckwheat was controlled by over 90%. In contrast, efficacy of TCM in field trials against perennial vining weeds was very low, 25% for field bindweed and 65% against hedge bindweed. Control efficacy could be well explained by the translocation pattern of TCM in vining weeds.

Keywords

Thiencarbazone-methylfield bindweed, Convolvulus arvensis L. CONARhedge bindweed, Calystegia sepium (L.) R. Br. CAGSEivyleaf morningglory, Ipomoea hederacea Jacq. IPOHEtall morningglory, Ipomoea purpurea (L.) Roth PHBPUwild buckwheat, Polygonum convolvulus L. POLCOcorn, Zea mays L. ZEAMA.Cornmode of action of herbicidevining weedsweed control
Type
Weed Management
Information
Weed Science , Volume 62 , Issue 3 , September 2014 , pp. 512 - 519
Copyright
Copyright © Weed Science Society of America 

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