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Soil Moisture, Relative Humidity, and Bentazon Affect Imazethapyr Absorption and Translocation in Common Ragweed (Ambrosia artemisiifolia)

Published online by Cambridge University Press:  12 June 2017

Aaron G. Hager ,
Karen A. Renner ,
Oliver Schabenberger  and
Donald Penner
Aaron G. Hager
Affiliation:
Department of Crop Sciences, University of Illinois, Turner Hall, Urbana, IL 61801
Karen A. Renner*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing. Ml 48824-1325
Oliver Schabenberger
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing. Ml 48824-1325
Donald Penner
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing. Ml 48824-1325
*
Corresponding author's E-mail: renner@pilot.msu.edu.
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Abstract

Soil moisture, relative humidity (RH), and the addition of bentazon were examined for effects on absorption and translocation of 14C-imazethapyr in common ragweed. When common ragweed was growing under conditions of low soil moisture (-300 kPa), absorption of 14C-imazethapyr was reduced from 51 to 42%. Translocation of 14C-imazethapyr was not affected by soil moisture. In the absence of bentazon, absorption and translocation of 14C-imazethapyr was similar at 65 and 85% RH 48 and 168 h after treatment. Bentazon decreased absorption of 14C-imazethapyr from 61 to 26% at 65% RH and from 65 to 57% at 85% RH 168 h after treatment. Bentazon decreased translocation of 14C-imazethapyr from 35 to 9% at 65% RH and from 30 to 21% at 85% RH when averaged over time. This reduction in the absorption and translocation of 14C-imazethapyr when bentazon was added may result in a reduction in common ragweed control compared to imazethapyr alone when RH is 65% or lower.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxideimazethapyr, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcommon ragweed, Ambrosia artemisiifolia L. #AMBELAntagonismherbicide interactionAMBELRH, relative humidityHAT, hours after treatmentPOA, petroleum oil adjuvantPPFD, photosynthetic photon flux density
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 320 - 323
Copyright
Copyright © 1999 by the Weed Science Society of America 

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