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Imidazolinone-Resistant Soft Red Winter Wheat Weed Control and Crop Response to ALS-Inhibiting Herbicides

  • Timothy L. Grey (a1), George S. Cutts (a2) and Jerry Johnson (a3)

Abstract

Inability to control Italian ryegrass in soft red winter wheat can result in reduced yields, reduced quality, or both and cause double-crop planting to be inefficient. Experiments were conducted at Plains, GA, to evaluate diclofop-susceptible Italian ryegrass control in a single-gene imidazolinone (IMI)-resistant wheat using imazamox, mesosulfuron, and diclofop. Treatments were applied at variable rates and tank mixtures to the IMI-resistant soft red winter wheat ‘AGS CL7’ at Feekes' stages 1 (EMERG) or 2 (POST). Lower Italian ryegrass control of 78% or less was observed with single treatments of EMERG or POST herbicide applications. Diclofop provided maximum Italian ryegrass control of 79% or greater with minimal injury to wheat cultivar AGS CL 7. Sequential applications of diclofop at EMERG followed by imazamox, mesosulfuron, or diclofop POST provided maximum Italian ryegrass control at 86% or greater. The efficacy of the acetolactate synthase (ALS)–inhibiting herbicides registered for wheat weed control for AGS CL7 and ‘AGS 2000’ (conventional) was also evaluated. Mesosulfuron at 40 g ai ha−1 resulted in 17% injury at 7 d after application (DAA), tribenuron at 40 g ai ha−1 caused 9% injury 7 DAA, and pyroxsulam at 190 g ai ha−1 caused 7% injury at 7 DAA, but was transient and not observed after heading or at harvest. No yield differences were noted between the nontreated control for AGS 2000 and AGS CL 7 for chlorsulfuron, mesosulfuron, thifensulfuron, tribenuron, prosulfuron, and pyroxsulam.

La inhabilidad para controlar Lolium perenne en el trigo rojo suave de invierno puede resultar en reducción de rendimientos y/o calidad y causar que la doble siembra de este cereal sea ineficiente. Se realizaron experimentos en Plains, Georgia para evaluar el control de L. perenne susceptible a diclofop en trigo con un solo gen de resistencia a imidazolinone (IMI), usando imazamox, mesosulfuron y diclofop. Los tratamientos se aplicaron a dosis y mezclas variables a la variedad de trigo AGS CL7 resistente a IMI en las etapas Feekes 1 (EMERG) o 2 (POST). Un control bajo de L. perenne de 78% o menos, fue observado con tratamientos de una aplicación de herbicida en EMERG o POST. Diclofop proporcionó el mayor control de L. perenne de 79% o más, con daño mínimo al cultivar de trigo AGS CL 7. Las aplicaciones secuenciales de diclofop en EMERG seguidas de imazamox, mesosulfuron, o diclofop POST proporcionaron el máximo control de L. perenne, 86% o mayor. La eficacia de los herbicidas inhibidores acetolactate synthase (ALS) registrada para el control de malezas en trigo para los cultivares AGS CL7 y AGS 2000 (convencional) también fue evaluada. Mesosulfuron a 40 g ia ha−1 resultó en 17% de daño a los 7 días después de la aplicación (DAA); tribenuron a 40 g ia ha−1 causó 9% de daño a los 7 DAA; pyroxsulam a 190 g ia ha−1 causó 7% de daño a los 7 DAA, pero éste fue transitorio y no fue observado después de la floración o en la cosecha. No se notaron diferencias en el rendimiento entre los testigos no tratados para AGS 2000 y AGS CL 7 y los tratamientos con chlorsulfuron, mesosulfuron, thifensulfuron, tribenuron, prosulfuron y pyroxsulam.

Copyright

Corresponding author

Corresponding author's E-mail: tgrey@uga.edu

References

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