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Herbicide Program Approaches for Managing Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Waterhemp (Amaranthus tuberculatus and Amaranthus rudis) in Future Soybean-Trait Technologies

Published online by Cambridge University Press:  20 January 2017

Christopher J. Meyer*
Affiliation:
Department of Crop Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Jason K. Norsworthy
Affiliation:
Department of Crop Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Bryan G. Young
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Lawrence E. Steckel
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
Kevin W. Bradley
Affiliation:
Division of Plant Sciences, University of Missouri, Columbia, MO 65211
William G. Johnson
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Mark M. Loux
Affiliation:
Ohio State University, Columbus, OH 43210
Vince M. Davis
Affiliation:
Department of Agronomy, University of Wisconsin-Madison, Madison WI 53706
Greg R. Kruger
Affiliation:
University of Nebraska-Lincoln, North Platte, NE 69101
Mohammad T. Bararpour
Affiliation:
Department of Crop Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR 72704
Joseph T. Ikley
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Douglas J. Spaunhorst
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
Thomas R. Butts
Affiliation:
Department of Agronomy, University of Wisconsin-Madison, Madison WI 53706
*
Corresponding author's E-mail: cjmeyer@uark.edu.
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Abstract

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Herbicide-resistant Amaranthus spp. continue to cause management difficulties in soybean. New soybean technologies under development, including resistance to various combinations of glyphosate, glufosinate, dicamba, 2,4-D, isoxaflutole, and mesotrione, will make possible the use of additional herbicide sites of action in soybean than is currently available. When this research was conducted, these soybean traits were still regulated and testing herbicide programs with the appropriate soybean genetics in a single experiment was not feasible. Therefore, the effectiveness of various herbicide programs (PRE herbicides followed by POST herbicides) was evaluated in bare-ground experiments on glyphosate-resistant Palmer amaranth and glyphosate-resistant waterhemp (both tall and common) at locations in Arkansas, Illinois, Indiana, Missouri, Nebraska, and Tennessee. Twenty-five herbicide programs were evaluated; 5 of which were PRE herbicides only, 10 were PRE herbicides followed by POST herbicides 3 to 4 wks after (WA) the PRE application (EPOST), and 10 were PRE herbicides followed by POST herbicides 6 to 7 WA the PRE application (LPOST). Programs with EPOST herbicides provided 94% or greater control of Palmer amaranth and waterhemp at 3 to 4 WA the EPOST. Overall, programs with LPOST herbicides resulted in a period of weed emergence in which weeds would typically compete with a crop. Weeds were not completely controlled with the LPOST herbicides because weed sizes were larger (≥ 15 cm) compared with their sizes at the EPOST application (≤ 7 cm). Most programs with LPOST herbicides provided 80 to 95% control at 3 to 4 WA applied LPOST. Based on an orthogonal contrast, using a synthetic-auxin herbicide LPOST improves control of Palmer amaranth and waterhemp over programs not containing a synthetic-auxin LPOST. These results show herbicides that can be used in soybean and that contain auxinic- or HPPD-resistant traits will provide growers with an opportunity for better control of glyphosate-resistant Palmer amaranth and waterhemp over a wide range of geographies and environments.

Amaranthus spp. resistentes a herbicidas continúan causando problemas de manejo en soja. Nuevas tecnologías para soja que están actualmente en desarrollo y que incluyen resistencia a varias combinaciones de glyphosate, glufosinate, dicamba, 2,4-D, isoxaflutole, y mesotrione, harán posible el uso de sitios de acción que no están actualmente disponibles para uso en soja. Cuando se realizó esta investigación, estas tecnologías estaban todavía bajo regulación y la evaluación de programas de herbicidas con la genética apropiada de soja en un solo experimento no era factible. Por esto, se evaluó la efectividad de varios programas de herbicidas (herbicidas PRE seguidos de herbicidas POST) en experimentos con suelo desnudo en localidades en Arkansas, Illinois, Indiana, Missouri, Nebraska, y Tennessee que tenían Amaranthus palmeri resistente a glyphosate y Amaranthus rudis y Amaranthus tuberculatus resistentes a glyphosate. Se evaluaron 25 programas de herbicidas; 5 de los cuales fueron solamente herbicidas PRE, 10 fueron herbicidas PRE seguidos por herbicidas POST 3 a 4 semanas después (WA) de la aplicación PRE (EPOST), y 10 fueron herbicidas PRE seguidos por herbicidas POST 6 a 7 WA de la aplicación PRE (LPOST). Los programas con herbicidas EPOST brindaron 94% de control o más de A. palmeri, A. tuberculatus, y A. rudis a 3 a 4 WA de la aplicación EPOST. En general, los programas con herbicidas LPOST resultaron en un período de emergencia de malezas en el cual las malezas típicamente competirían con el cultivo. Las malezas no fueron controladas completamente con los herbicidas LPOST porque el tamaño de las malezas fue mayor (≥15 cm) al compararse con su tamaño en la aplicación EPOST (≥7 cm). La mayoría de los programas con herbicidas LPOST brindaron 80 a 95% de control a 3 a 4 WA de la aplicación LPOST. Con base en un contraste ortogonal, el usar un herbicida de tipo auxina sintética LPOST mejoró el control de A. palmeri, A. rudis, y A. tuberculatus al compararse con programas que no contenían un herbicida de tipo auxina sintética LPOST. Estos resultados muestran que los herbicidas que pueden ser usados en soja resistente a herbicidas de tipo auxina o HPPD brindarán a los productores una oportunidad para controlar mejor A. palmeri, A. rudis, y A. tuberculatus resistentes a glyphosate, en un amplio rango de ambientes y geografías.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

Footnotes

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

References

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Herbicide Program Approaches for Managing Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Waterhemp (Amaranthus tuberculatus and Amaranthus rudis) in Future Soybean-Trait Technologies
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Herbicide Program Approaches for Managing Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) and Waterhemp (Amaranthus tuberculatus and Amaranthus rudis) in Future Soybean-Trait Technologies
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