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Evaluation of the Interaction between Glyphosate and Glufosinate

Published online by Cambridge University Press:  20 January 2017

Rachel K. Bethke ,
William T. Molin ,
Christy Sprague  and
Donald Penner
Rachel K. Bethke
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
William T. Molin
Affiliation:
USDA-ARS, Stoneville, MS
Christy Sprague
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
Donald Penner*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
*
Corresponding author's E-mail: [email protected]
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Abstract

Crops transformed to provide resistance to herbicides with two different mechanisms of action provide new opportunities for control of herbicide-resistant weeds. However, unexpected interactions may develop, especially for herbicides not generally used in tank-mixtures. The objectives of this study were to evaluate weed control and determine herbicide interactions and fluorescence responses with combinations of glyphosate and glufosinate on selected weeds prevalent in Michigan cropping systems. Field studies to determine herbicide interactions resulted in synergism only at 0.84 kg ae ha−1 of glyphosate and 0.47 kg ai ha−1 glufosinate in 2008. Early synergism (7 d after treatment [DAT]) was observed in the field at several combined rates for common lambsquarters and velvetleaf in 2009, and in the greenhouse for giant foxtail. Differences between years were perhaps due to the effect of environmental conditions on herbicide absorption and translocation. Antagonism was observed in the field in 2009 for velvetleaf, common lambsquarters, and giant foxtail especially at 840 g ae ha−1 glyphosate and 118 g ai ha−1 glufosinate, 28 DAT. Antagonism was also observed in the greenhouse for giant foxtail and Canada thistle, 28 DAT. Fluorescence measurements on Canada thistle in the greenhouse showed that glufosinate and glufosinate plus glyphosate acted rapidly to quench electron transport of photosystem II (PS II) system of photosynthesis, and the fluorescence characteristics of the glyphosate and glufosinate combinations were indistinguishable from glufosinate alone.

Keywords

GlufosinateglyphosateCanada thistle, Cirsium arvense (L.) Scopcommon lambsquarters, Chenopodium album Lgiant foxtail, Setaria faberi Herrmvelvetleaf, Abutilon theophrasti MedikAdditive effectantagonismherbicide interactionreduced ratessynergism
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 61 , Issue 1 , March 2013 , pp. 41 - 47
Copyright
Copyright © Weed Science Society of America 

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