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Management of ACCase-Inhibiting Herbicide-Resistant Smooth Barley (Hordeum glaucum) in Field Pea with Alternative Herbicides

Published online by Cambridge University Press:  20 January 2017

Lovreet S. Shergill ,
Benjamin Fleet ,
Christopher Preston  and
Gurjeet Gill
Lovreet S. Shergill*
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia, 5064
Benjamin Fleet
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia, 5064
Christopher Preston
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia, 5064
Gurjeet Gill
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, PMB 1, Glen Osmond, South Australia, 5064
*
Corresponding author's E-mail: lovreet.shergill@adelaide.edu.au.
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Abstract

Smooth barley is an annual weed species that is infesting crops and pastures in South Australia. Complicating control options is the presence of herbicide-resistant biotypes. A field trial was conducted to identify alternative herbicides for the management of acetyl coenzyme A carboxylase (ACCase)-inhibiting herbicide-resistant smooth barley in field pea. Preplant (PP) soil applications of pyroxasulfone; prosulfocarb plus S-metolachlor; dimethenamid-P; propyzamide; trifluralin alone or with triallate or with diuron; or imazamox applied POST were evaluated for their effectiveness and crop safety. Propyzamide, pyroxasulfone, or imazamox applied POST provided a high level of smooth barley control, did not cause any crop injury, and increased field pea grain or forage yield compared with the nontreated. Furthermore, propyzamide or pyroxasulfone reduced panicle density and seed production in smooth barley, whereas the effectiveness of POST imazamox varied over the two seasons. Dimethenamid-P reduced the impact of smooth barley on field pea yield, but cause stunting, and was less effective than propyzamide, pyroxasulfone, and imazamox in reducing smooth barley seed production. Negative relationship between field pea yield and smooth barley panicle density indicated that smooth barley is highly competitive in field pea crops and can cause large yield losses. The results of this investigation suggest that propyzamide or pyroxasulfone applied PP and imazamox applied POST could be used effectively in the field for the management of ACCase-inhibiting herbicide-resistant smooth barley in South Australia.

Hordeum murinum ssp. glaucum es una especie de maleza anual que infesta cultivos y pasturas en el sur de Australia. Además, la presencia de biotipos resistentes a herbicidas complica las opciones de control. Se realizó un estudio de campo para identificar herbicidas alternativos para el manejo de H. murinum resistente a herbicidas inhibidores de acetyl coenzyme A carboxylase (ACCase) en guisante. Aplicaciones al suelo presiembra (PP) de pyroxasulfone, prosulfocarb más S-metolachlor, dimethenamid-P, propyzamide, trifluralin solo o con triallate o con diuron; o imazamox aplicado POST, fueron evaluados para determinar su efectividad y la seguridad en el cultivo. Propyzamide, pyroxasulfone, o imazamox aplicado POST brindaron un alto nivel de control de H. murinum, no causaron ningún daño al cultivo, e incrementaron el rendimiento de grano y de forraje del guisante al compararse con el testigo sin tratamiento. Además, propyzamide o pyroxasulfone redujeron la densidad de panículas y la producción de semilla de H. murinum, mientras que la efectividad de imazamox POST varió en las dos temporadas. Dimethenamid-P redujo el impacto de H. murinum sobre el rendimiento del cultivo, pero causó retrasos y redujo el crecimiento del cultivo, y fue menos efectivo que propyzamide, pyroxasulfone, e imazamox para reducir la producción de semilla de H. murinum. Una relación negativa entre el rendimiento del guisante y la densidad de panículas de H. murinum indicó que esta maleza es altamente competitiva en los campos de guisante y puede causar grandes pérdidas de rendimiento. Los resultados de esta investigación sugieren que propyzamide o pyroxasulfone aplicados PP e imazamox aplicado POST podrían ser usados en forma efectiva en el campo para el manejo de H. murinum resistente a herbicidas inhibidores de ACCase en el sur de Australia.

Keywords

Dimethenamid-Pdiuron, imazamoxpropyzamideprosulfocarb plus S-metolachlorpyroxasulfonetriallatetrifluralinsmooth barley, Hordeum murinum L. ssp. glaucum (Steud.) Tzvelevfield pea, Pisum sativum L.Barley grasscrop selectivityherbicide efficacyherbicide resistancePOSTpostemergencePPpreplant
Type
Research Article
Information
Weed Technology , Volume 30 , Issue 2 , June 2016 , pp. 441 - 447
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Mark VanGessel, University of Delaware.

References

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