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Glyphosate-Resistant Common Ragweed (Ambrosia artemisiifolia) in Nebraska: Confirmation and Response to Postemergence Corn and Soybean Herbicides

  • Zahoor A. Ganie (a1) and Amit J. Jhala (a1)


Common ragweed is an important broadleaf weed in agronomic crops in the northcentral United States. A common ragweed biotype in glyphosate-resistant (GR) soybean production field in southeast Nebraska was not controlled after sequential applications of glyphosate at the labeled rate. The objectives of this study were to confirm GR common ragweed in Nebraska by quantifying the level of resistance in greenhouse and field whole-plant dose-response studies and to evaluate the response of the putative GR common ragweed to POST corn and soybean herbicides. Greenhouse whole-plant dose-response studies confirmed 7- and 19-fold resistance to glyphosate compared to the known glyphosate-susceptible (GS) biotype based on biomass reduction and control estimates, respectively. Field dose-response studies conducted in 2015 and 2016 at the putative GR common ragweed research site suggested that glyphosate doses equivalent to 15- and 40-times the labeled rate (1,260 gaeha–1) were required for 90% control and biomass reduction, respectively. Response of GR common ragweed to POST soybean herbicides in greenhouse studies indicated ≥89% control with acifluorfen, fomesafen, fomesafen plus glyphosate, glyphosate plus dicamba or 2,4-D choline, glufosinate, imazamox plus acifluorfen, and lactofen. POST corn herbicides, including 2,4-D, bromoxynil, diflufenzopyr plus dicamba, glufosinate, halosulfuron-methyl plus dicamba, mesotrione plus atrazine, and tembotrione provided ≥87% control, indicating that POST herbicides with distinct modes of action are available in corn and soybean for effective control of GR common ragweed. Results also suggested a reduced efficacy of the acetolactate synthase (ALS)-inhibiting herbicides tested in this study for control of GR and GS biotypes, indicating further research is needed to determine whether this biotype has evolved multiple herbicide resistance.

Ambrosia artemisiifolia es una maleza de hoja ancha importante en cultivos agronómicos en el centro norte de Estados Unidos. Un biotipo de A. artemisiifolia resistente a glyphosate (GR) no fue controlado en un campo de producción de soja en el sureste de Nebraska, después de aplicaciones secuenciales de glyphosate a la dosis de la etiqueta. Los objetivos de este estudio fueron confirmar la existencia de A. artemisiifolia GR en Nebraska cuantificando el nivel de resistencia con estudios de respuesta a dosis en invernadero y en campo y evaluar la respuesta de A. artemisiifolia GR putativa a herbicidas POST para maíz y soja. Los estudios de respuesta a dosis en invernadero con plantas enteras confirmaron una resistencia a glyphosate 7 y 19 veces mayor al compararse con un biotipo con susceptibilidad conocida a glyphosate (GS), según los estimados de reducción de biomasa y de control, respectivamente. Los estudios de respuesta a dosis en campo realizados en 2015 y 2016 en un lugar experimental con A. artemisiifolia GR putativa sugirió que se requirieron dosis equivalentes a 15 y 40 veces la dosis de la etiqueta (1,260 gaha−1) para alcanzar un 90% de control y un 90% de reducción de la biomasa, respectivamente. La respuesta en estudios de invernadero de A. artemisiifolia GR a herbicidas POST para soja indicó ≥89% de control con acifluorfen, fomesafen, fomesafen más glyphosate, glyphosate más dicamba o 2,4-D choline, glufosinate, imazamox más acifluorfen, y lactofen. Herbicidas POST para maíz, incluyendo 2,4-D, bromoxynil, diflufenzopyr más dicamba, glufosinate, halosulfuron-methyl más dicamba, mesotrione más atrazine, y tembotrione brindaron ≥87% de control, indicando que herbicidas POST con modos de acción distintivos están disponibles en maíz y soja para el control efectivo de A. artemisiifolia GR. Los resultados también sugirieron que existe una eficacia reducida con herbicidas inhibidores de acetolactate synthase (ALS) evaluados en este estudio para el control de biotipos GR y GS, lo que indica que se necesita investigación adicional para determinar si este biotipo ha evolucionado resistencia a múltiples herbicidas.


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Associate Editor for this paper: Aaron Hager, University of Illinois.



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Glyphosate-Resistant Common Ragweed (Ambrosia artemisiifolia) in Nebraska: Confirmation and Response to Postemergence Corn and Soybean Herbicides

  • Zahoor A. Ganie (a1) and Amit J. Jhala (a1)


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