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Comparison of Herbicide Tactics to Minimize Species Shifts and Selection Pressure in Glyphosate-Resistant Soybean

Published online by Cambridge University Press:  20 January 2017

Gregg Johnson*
Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108
Fritz Breitenbach
University of Minnesota Extension Regional Center, Rochester, MN 55904
Lisa Behnken
University of Minnesota Extension Regional Center, Rochester, MN 55904
Ryan Miller
University of Minnesota Extension Regional Center, Rochester, MN 55904
Tom Hoverstad
Southern Research and Outreach Center, University of Minnesota, Waseca, MN 56093
Jeffrey Gunsolus
Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108
Corresponding author's E-mail:


There are significant concerns over the long- and short-term implications of continuous glyphosate use and potential problems associated with weed species shifts and the development of glyphosate-resistant weed species. Field research was conducted to determine the effect of herbicide treatment and application timing on weed control in glyphosate-resistant soybean. Ten herbicide treatments were evaluated that represented a range of PPI, PRE, and POST-only application timings. All herbicide treatments included a reduced rate of glyphosate applied POST. PRE herbicides with residual properties followed by (fb) glyphosate POST provides more effective control of broadleaf weed species than POST-only treatments. There was no difference in soybean yield between PRE fb POST and POST-only treatments in 2008. Conversely, PRE fb POST herbicide treatments resulted in greater yield than POST-only treatments in 2009. Using PRE fb POST herbicide tactics improves weed control and reduces the risk for crop yield loss when dealing with both early- and late-emerging annual broadleaf weed species across variable cropping environments.

Existen preocupaciones importantes sobre las implicaciones a largo y corto plazo del uso continuo de glifosato y los problemas potenciales asociados con los cambios en las comunidades de malezas y el desarrollo de especies de malezas resistentes al glifosato. Se realizaron investigaciones de campo para determinar el efecto de los tratamientos y momentos de aplicación de herbicidas en el control de malezas en soya resistente al glifosato. Se evaluaron diez tratamientos de herbicida que representaron una variedad de momentos de aplicación PPI, PRE y POST-solamente. Todos los tratamientos incluyeron una dosis reducida de glifosato aplicado POST. Los herbicidas PRE con propiedades residuales seguidos de glifosato POST proporcionaron un control más eficaz de malezas de hoja ancha que los tratamientos solamente POST. No hubo ninguna diferencia en el rendimiento de la soya entre los tratamientos PRE seguidos por POST y los solamente POST en 2008. En cambio, en 2009, los tratamientos PRE seguidos por (fb) POST tuvieron como resultado mayor rendimiento que los tratamientos solamente POST. El uso de tácticas de que incluyan herbicidas PRE seguidos por POST mejora el control de malezas y reduce el riesgo de pérdidas en el rendimiento del cultivo cuando se trata con malezas anuales de hoja ancha, tempranas y tardías, en ambientes variables de cultivo.

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

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