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Management of Large, Glyphosate-Resistant Palmer Amaranth (Amaranthus palmeri) in Corn

  • Whitney D. Crow (a1), Lawrence E. Steckel (a1), Thomas C. Mueller (a2) and Robert M. Hayes (a1)

Abstract

Palmer amaranth is a very problematic weed that has evolved resistance to several classes of herbicides, including 5-enolypyruvylshikimate-3-phosate synthase–inhibiting herbicides and photosystem II–inhibiting herbicides. In recent years, corn producers have had difficulty controlling large Palmer amaranth (> 20 cm) in corn > 30 cm whether it be due to environmental conditions or management failures. Palmer amaranth management in corn this tall is made even more challenging because atrazine is not labeled POST in corn > 30 cm tall. Therefore, a study was conducted in 2013 and 2014 in Jackson, TN, to evaluate herbicide programs in corn > 30 cm tall for the control of glyphosate-resistant Palmer amaranth > 20 cm tall. Treatments consisted of herbicides applied alone and in mixtures with dicamba plus diflufenzopyr. Herbicides were applied POST to corn between the V5 and V6 growth stages. Dicamba plus diflufenzopyr 28 d after application controlled Palmer amaranth > 87%. The herbicides alone or in combinations applied as tank mixtures did not improve control (< 76%) over dicamba plus diflufenzopyr alone. There were no grain-yield differences among treatments because of Palmer amaranth control. This was likely due to the Palmer amaranth competition having already affected corn yield by the V5 to V6 corn growth stages.

Amaranthus palmeri es una maleza muy problemática que ha evolucionado resistencia a varias clases de herbicidas, incluyendo herbicidas inhibidores de 5-enolpyruvylshikimate-3-phosphate synthase y herbicidas inhibidores del fotosistema II. En años recientes, productores de maíz han tenido dificultades para controlar plantas grandes (>20 cm) de A. palmeri en maíz >30 cm, ya sea debido a condiciones ambientales o a fallas en el manejo. El manejo de A. palmeri en maíz de esta altura se ha hecho más difícil porque atrazine no está registrado para aplicaciones POST en maíz >30 cm de altura. Por esta razón, se realizó un estudio en 2013 y 2014 en Jackson, Tennessee, para evaluar programas de herbicidas en maíz >30 cm de altura para el control de A. palmeri >20 cm resistente a glyphosate. Los tratamientos consistieron de herbicidas aplicados solos y en mezclas con dicamba más diflufenzopyr. Los herbicidas fueron aplicados al maíz POST entre los estadios de crecimiento V5 y V6. Dicamba más diflufenzopyr 28 d después de la aplicación controló A. palmeri >87%. Los herbicidas solos o en combinaciones aplicados como mezclas en tanque no mejoraron el control (<76%) en comparación con solo dicamba más diflufenzopyr. No hubo diferencias en el rendimiento de grano entre tratamientos debido al control de A. palmeri. Este se debió probablemente a que la competencia de A. palmeri ya había afectado el rendimiento del maíz en los estadios de crecimiento V5 y V6.

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Corresponding author

Corresponding author's E-mail: lsteckel@utk.edu

Footnotes

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Associate Editor for this paper: William Johnson, Purdue University.

Footnotes

References

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