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ACCase-Inhibiting Herbicide-Resistant Avena spp. Populations from the Western Australian Grain Belt

  • M. S. Ahmad-Hamdani (a1), Mechelle J. Owen (a2), Qin Yu (a2) and Stephen B. Powles (a2)


Avena spp. are world weeds with many cases of evolved herbicide resistance. In Australia, Avena spp. (wild oat and sterile oat) are a major problem, especially in grain crops. Acetyl-CoA carboxylase (ACCase)–inhibiting herbicides have been used extensively since the late 1970s for Avena spp. control. However, continued reliance on these herbicides has resulted in the evolution of resistant Avena spp. populations. Resistance across many ACCase-inhibiting herbicides was characterized in four Avena spp. populations from the Western Australian grain belt. Dose–response experiments were conducted to determine the level of resistance to the aryloxyphenoxypropionates and cyclohexanediones and to the phenylpyrazoline herbicide pinoxaden. On the basis of resistance index values, all four resistant populations exhibited high-level diclofop resistance but varied in the level of resistance to other ACCase-inhibiting herbicides tested. It is evident that Avena spp. populations from the Western Australian grain belt have evolved resistance to a number of ACCase-inhibiting herbicides.

Avena spp. son malezas mundiales con muchos casos de evolución de resistencia a herbicidas. En Australia, Avena spp., (A. fatua y A. sterilis), representan un gran problema, especialmente en cultivos de grano. Herbicidas inhibidores de la acetil-CoA carboxylase (ACCase) se han usado extensivamente desde finales de los años 1970's para el control de Avena spp. Sin embargo, la continua dependencia en estos herbicidas ha resultado en la evolución de poblaciones de Avena spp. resistentes. La resistencia a varios herbicidas inhibidores ACCase fue caracterizada en cuatro poblaciones de estas malezas en el cinturón de granos del occidente de Australia. Se realizaron experimentos de respuesta a dosis para determinar el nivel de resistencia a los aryloxyphenoxypropionates (APPs), a los cyclohexanediones (CHDs), y al pinoxaden, un herbicida phenylpyrazoline (PPZ). Basado en el índice de valores de resistencia, todas las cuatro poblaciones resistentes exhibieron altos niveles de resistencia al diclofop, pero variaron en el nivel de resistencia a otros herbicidas inhibidores ACCase. Es evidente que las poblaciones de Avena spp. del cinturón de granos del occidente australiano han desarrollado resistencia a un número de herbicidas inhibidores ACCase.


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