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Evaluation of the Interaction between Glyphosate andGlufosinate

Published online by Cambridge University Press:  20 January 2017

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: pennerd@msu.edu
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Abstract

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Crops transformed to provide resistance to herbicides with two differentmechanisms of action provide new opportunities for control ofherbicide-resistant weeds. However, unexpected interactions may develop,especially for herbicides not generally used in tank-mixtures. Theobjectives of this study were to evaluate weed control and determineherbicide interactions and fluorescence responses with combinations ofglyphosate and glufosinate on selected weeds prevalent in Michigan croppingsystems. Field studies to determine herbicide interactions resulted insynergism 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 commonlambsquarters and velvetleaf in 2009, and in the greenhouse for giantfoxtail. Differences between years were perhaps due to the effect ofenvironmental conditions on herbicide absorption and translocation.Antagonism was observed in the field in 2009 for velvetleaf, commonlambsquarters, and giant foxtail especially at 840 g ae ha−1glyphosate and 118 g ai ha−1 glufosinate, 28 DAT. Antagonism wasalso observed in the greenhouse for giant foxtail and Canada thistle, 28DAT. Fluorescence measurements on Canada thistle in the greenhouse showedthat glufosinate and glufosinate plus glyphosate acted rapidly to quenchelectron transport of photosystem II (PS II) system of photosynthesis, andthe fluorescence characteristics of the glyphosate and glufosinatecombinations were indistinguishable from glufosinate alone.

Information

Type
Physiology, Chemistry, and Biochemistry
Copyright
Copyright © Weed Science Society of America