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Glyphosate-Resistant Giant Ragweed (Ambrosia trifida) and Waterhemp (Amaranthus rudis) Management in Dicamba-Resistant Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Douglas J. Spaunhorst ,
Simone Siefert-Higgins  and
Kevin W. Bradley
Douglas J. Spaunhorst
Affiliation:
Division of Plant Sciences, 5 Waters Hall, University of Missouri, Columbia, MO 65211
Simone Siefert-Higgins
Affiliation:
Monsanto Corporation, 800 N. Lindbergh, Creve Coeur, MO 63141
Kevin W. Bradley*
Affiliation:
Division of Plant Sciences, 201 Waters Hall, Columbia, MO 76211
*
Corresponding author's E-mail: BradkeyKe@missouri.edu.
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Abstract

Field experiments were conducted across two locations during 2011 and 2012 to evaluate herbicide options for the control of glyphosate-resistant (GR) giant ragweed and GR waterhemp in dicamba-resistant (DR) soybean. All herbicide treatments provided 91 to 100% control of GR giant ragweed 3 wk after treatment (WAT). Flumioxazin plus dicamba plus glyphosate applied preplant provided greater control and density reduction of GR giant ragweed than flumioxazin plus 2,4-D plus glyphosate. When flumioxazin plus dicamba plus glyphosate were applied preplant, the addition of dicamba to glyphosate at either the early-postemergence (EPOST) or mid-postemergence (MPOST) timing provided greater control and density reduction of GR giant ragweed than glyphosate alone. Regardless of the preplant treatment, delay of EPOST dicamba to the MPOST timing did not influence GR giant ragweed control or density reduction. In the GR waterhemp experiment, dicamba plus glyphosate applied sequentially provided 88 to 89% control and 90% density reduction at the EPOST and MPOST timings compared to only 24% control and 42% density reduction in response to glyphosate applied sequentially. Control and GR waterhemp density reduction did not improve with the addition of acetochlor to either the EPOST or late-postemergence (LPOST) timings. Flumioxazin plus chlorimuron applied PRE followed by dicamba plus glyphosate or dicamba plus glyphosate plus acetochlor provided greater control of GR waterhemp than glyphosate plus fomesafen or glyphosate alone applied EPOST. Results from this research indicate that dicamba applied once or sequentially and when timed appropriately to match the biology of the weed species can be utilized as a component of an integrated program for the management of GR weeds like giant ragweed and waterhemp in DR soybean.

Se realizaron experimentos de campo en dos localidades durante 2011 y 2012 para evaluar las opciones de herbicidas para el control de Ambrosia trifida resistente a glyphosate (GR) y Amaranthus rudis GR, en soya resistente a dicamba (DR). Todos los tratamientos de herbicidas brindaron 91 a 100% de control de A. trifida GR, 3 semanas después del tratamiento (WAT). Flumioxazin más dicamba más glyphosate aplicados pre-siembra brindaron mayor control y una mayor reducción en la densidad de A. trifida GR que flumioxazin más 2,4-D más glyphosate. Cuando se aplicó flumioxazin más dicamba más glyphosate en pre-siembra, la adición de dicamba a glyphosate, ya sea en post-emergencia temprana (EPOST) o post-emergencia media (MPOST), brindó mayor control y mayor reducción de la densidad de A. trifida GR que glyphosate solo. Sin importar el tratamiento pre-siembra, el retrasar la aplicación de dicamba de EPOST a MPOST no influenció el control o la reducción en la densidad de A. trifida GR. En el experimento de A. rudis GR, las aplicaciones secuenciales de dicamba más glyphosate brindaron 88 a 89% de control y 90% de reducción en la densidad en EPOST y MPOST al compararse con solamente 24% de control y 42% en la reducción de la densidad en respuesta a glyphosate aplicado secuencialmente. El control y la reducción en la densidad de A. rudis GR no mejoró con la adición de acetochlor a las aplicaciones EPOST o post-emergencia tardía (LPOST). Flumioxazin más chlorimuron aplicados PRE seguidos de dicamba más glyphosate o dicamba más glyphosate más acetochlor brindaron mayor control de A. rudis GR que glyphosate más fomesafen o glyphosate solo aplicado EPOST. Los resultados de esta investigación indican que la aplicación sola o secuencial de dicamba en el momento apropiado según la biología de la especie de maleza puede ser utilizada como un componente del programa integrado para el manejo de malezas GR tales como A. trifida y A. rudis en soya DR.

Keywords

2,4-Dacetochlorchlorimurondicambaflumioxazinfomesafenglyphosategiant ragweed, Ambrosia trifida L.waterhemp, Amaranthus rudis Sauersoybean, Glycine max (L.) MerrConroldensity reductionpostemergencepreplant
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 1 , March 2014 , pp. 131 - 141
Copyright
Copyright © Weed Science Society of America 

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