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Glyphosate-Resistant Giant Ragweed (Ambrosia trifida) Control in Dicamba-Tolerant Soybean

Published online by Cambridge University Press:  20 January 2017

Joseph P. Vink ,
Nader Soltani ,
Darren E. Robinson ,
François J. Tardif ,
Mark B. Lawton  and
Peter H. Sikkema
Joseph P. Vink
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, Canada N0P 2C0
Nader Soltani*
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, Canada N0P 2C0
Darren E. Robinson
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, Canada N0P 2C0
François J. Tardif
Affiliation:
Department of Plant Agriculture, Guelph, 50 Stone Road East, Guelph, ON, Canada N1G 2W1
Mark B. Lawton
Affiliation:
Monsanto Canada Inc., Guelph, ON, Canada N1G 0B4
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main St. East, Ridgetown, ON, Canada N0P 2C0
*
Corresponding author's E-mail: nsoltani@ridgetownc.uoguelph.ca
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Abstract

Glyphosate-resistant (GR) giant ragweed has been confirmed in Ontario, Canada. Giant ragweed is an extremely competitive weed and lack of control in soybean will lead to significant yield losses. Seed companies have developed new herbicide-resistant (HR) crop cultivars and hybrids that stack multiple HR traits. The objective of this research was to evaluate the efficacy of glyphosate and glyphosate plus dicamba tank mixes for the control of GR giant ragweed under Ontario environmental conditions in dicamba-tolerant (DT) soybean. Three field trials were established over a 2-yr period (2010 and 2011) on farms near Windsor and Belle River, ON. Treatments included glyphosate (900 g ae ha−1), dicamba (300 g ae ha−1), and dicamba (600 g ha−1) applied preplant (PP), POST, or sequentially in various combinations. Glyphosate applied PP, POST, or sequentially provided 22 to 68%, 40 to 47%, and 59 to 95% control of GR giant ragweed and reduced shoot dry weight 26 to 80%, 16 to 50%, and 72 to 98%, respectively. Glyphosate plus dicamba applied PP followed by glyphosate plus dicamba applied POST consistently provided 100% control of GR giant ragweed. DT soybean yield correlated with GR giant ragweed control. This is the first report in Canada of weed control in DT soybean, specifically for the control of GR giant ragweed. Results indicate that the use of dicamba in DT soybean will provide an effective option for the control of GR giant ragweed in Ontario.

La presencia de Ambrosia trifida resistente a glyphosate (GR) se ha confirmado en Ontario, Canadá. A. trifida es una maleza extremadamente competitiva y la falta de control en soya tendrá como resultado importantes pérdidas en el rendimiento. Las compañías de semillas han desarrollado nuevos cultivares e híbridos resistentes a herbicidas (HR), los cuales incluyen la combinación de múltiples mecanismos de resistencia a herbicidas. El objetivo de ésta investigación fue evaluar la eficacia de glyphosate y mezclas de glyphosate más dicamba para el control de A. trifida GR bajo las condiciones ambientales de Ontario en soya resistente a dicamba. Se establecieron tres ensayos de campo por un período de dos años (2010 y 2011) en fincas cercanas a Windsor y Belle River, Ontario. Los tratamientos incluyeron glyphosate (900 g ea ha−1), dicamba (300 g ea ha−1) y dicamba (600 g ha−1), aplicados ya sea antes de la siembra (PP), POST, o secuencialmente en varias combinaciones. Glyphosate aplicado PP, POST o secuencialmente proporcionó de 22 a 68, de 40 a 47 y de 59 a 95% de control de A. trifida GR y redujo el peso seco de la parte aérea de 26 a 80, de 16 a 50 y de 72 a 98%, respectivamente. Glyphosate más dicamba aplicados PP seguido por glyphosate más dicamba aplicados POST, consistentemente proporcionaron 100% de control de A. trifida GR. El rendimiento de la soya resistente a dicamba estuvo correlacionado con el control de A. trifida GR. Este es el primer reporte en Canadá de control de malezas en soya-resistente a dicamba, específicamente para el control de A. trifida GR. Los resultados indican que el uso de dicamba en soya resistente a este herbicida proporcionará una opción efectiva para el control de A. trifida GR en Ontario.

Keywords

dicambaglyphosategiant ragweed, Ambrosia trifida L.soybean, Glycine max (L.) MerrGlyphosate resistancemultiple-herbicide–resistant cropspreplant herbicidesPOST herbicides
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 26 , Issue 3 , September 2012 , pp. 422 - 428
Copyright
Copyright © Weed Science Society of America 

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