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A Survey of Glyphosate-Resistant Waterhemp (Amaranthus rudis) in Missouri Soybean Fields and Prediction of Glyphosate Resistance in Future Waterhemp Populations Based on In-Field Observations and Management Practices

Published online by Cambridge University Press:  20 January 2017

Kristin K. Rosenbaum
Affiliation:
Division of Plant Sciences, 205 Waters Hall, University of Missouri, Columbia, MO 65211
Kevin W. Bradley*
Affiliation:
Division of Plant Sciences, 201 Waters Hall, University of Missouri, Columbia, MO 65211
*
Corresponding author's E-mail: [email protected]

Abstract

A survey of soybean fields containing waterhemp infestations was conducted just prior to harvest in 2008 and 2009 to determine the frequency and distribution of glyphosate-resistant waterhemp in Missouri, and to determine if there are any in-field parameters that may serve as indicators of glyphosate resistance in this species in future crop production systems. Glyphosate resistance was confirmed in 99 out of 144, or 69%, of the total waterhemp populations sampled, which occurred in 41 counties of Missouri. Populations of glyphosate-resistant waterhemp were more likely to occur in fields with no other weed species present at the end of the season, continuous cropping of soybean, exclusive use of glyphosate for several consecutive seasons, and waterhemp plants showing obvious signs of surviving herbicide treatment compared to fields characterized with glyphosate-susceptible waterhemp. Therefore, it is suggested that these four site parameters, and certain combinations of these parameters, serve as predictors of glyphosate resistance in future waterhemp populations.

En 2008 y 2009, poco antes de la cosecha, se realizó un estudio observacional en campos de soya infestados con Amaranthus rudis y/o Amaranthus tuberculatus para determinar la frecuencia y distribución de biotipos de estas especies resistentes a glyphosate en Missouri, y determinar si hay parámetros en campo que puedan ser usados como indicadores de resistencia a glyphosate en estas especies para futuros sistemas de producción de cultivos. Se confirmó la resistencia a glyphosate en 99 de 144, ó 69% del total de poblaciones muestreadas, lo cual ocurrió en 41 condados de Missouri. Las probabilidad de encontrar poblaciones de estas especies resistentes a glyphosate fue mayor en campos donde no se encontró ninguna otra especie de malezas al final de la temporada de crecimiento, en sistemas de cultivo continuo de soya, donde hubo uso exclusivo de glyphosate por varias temporadas consecutivas, y cuando las plantas de A. rudis o A. tuberculatus mostraron signos obvios de haber sobrevivido al tratamiento con herbicidas, al compararse con campos caracterizados por poblaciones susceptibles a glyphosate. De esta forma, se sugiere que estos cuatro parámetros de sitio, y ciertas combinaciones de estos parámetros, sirven como predictores de resistencia a glyphosate en futuras poblaciones de A. rudis y A. tuberculatus.

Type
Weed Management—Major Crops
Copyright
Copyright © Weed Science Society of America 

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