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Efficacy of Glyphosate Plus Bentazon or Quizalofop on Glyphosate-Resistant Canola or Corn

Published online by Cambridge University Press:  20 January 2017

Bo Tao ,
Jingkai Zhou ,
Calvin G. Messersmith  and
John D. Nalewaja
Bo Tao
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
Jingkai Zhou*
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
Calvin G. Messersmith
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
John D. Nalewaja
Affiliation:
Department of Plant Sciences, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: [email protected]
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Abstract

Greenhouse experiments were conducted to determine the effect of glyphosate on efficacy of bentazon for glyphosate-resistant (GR) canola control and of quizalofop for GR corn control. Control also was evaluated for glyphosate plus bentazon on wild buckwheat and wheat and glyphosate plus quizalofop on velvetleaf. Glyphosate plus bentazon synergistically controlled GR canola and wild buckwheat but were antagonistic for wheat control. Glyphosate plus quizalofop were additive for control of GR corn and velvetleaf. Inert ingredients in glyphosate formulations, i.e., cationic surfactant, NH4, or K, contributed to glyphosate synergism of bentazon, but the major contribution came from glyphosate itself. Efficacy of glyphosate plus bentazon on GR canola was enhanced by ammonium nitrate (AMN), ammonium sulfate (AMS), nonionic surfactant (NIS), or silicone surfactant (SiS) but was slightly decreased by methylated seed oil (MSO) or petroleum oil concentrate. AMN, AMS, NIS, and SiS partially overcame the antagonism of bentazon to glyphosate for wheat control. NIS enhanced phytotoxicity of glyphosate plus quizalofop to GR corn and velvetleaf, but the enhancement was less than by SiS or MSO to GR corn and SiS or AMS to velvetleaf.

Keywords

Bentazonglyphosatequizalofopvelvetleaf, Abutilon theophrasti (L.) Medic. ABUTHwild buckwheat, Polygonum convolvulus L. POLCOcanola, Brassica napus L.corn, Zea mays L.wheat, Triticum aestivum L.Adjuvantantagonismglyphosate-resistant volunteer cropsynergism
Type
Research
Information
Weed Technology , Volume 21 , Issue 1 , March 2007 , pp. 97 - 101
Copyright
Copyright © Weed Science Society of America 

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