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Control of Rigid Ryegrass in Australian Wheat Production with Pyroxasulfone

  • Peter Boutsalis (a1), Gurjeet S. Gill (a1) and Christopher Preston (a1)

In Australia, most wheat is sown in a no-till system without prior cultivation where herbicides are applied prior to sowing and incorporated by the planter. Trifluralin has been the most widely used PRE herbicide to control rigid ryegrass. The objective of this research was to determine crop safety and efficacy of alternative mechanism of action PRE herbicides for rigid ryegrass control in no-till wheat production. Pyroxasulfone achieved 98% control with PRE applications. The alternative PRE herbicides tested alone and in mixtures occasionally resulted in a significant reduction in wheat emergence but not crop yield. Trifluralin treatments failed at sites having trifluralin-resistant rigid ryegrass. Pyroxasulfone and prosulfocarb plus S-metolachlor were effective for control of rigid ryegrass across all trials with control ranging from 64 to 94%. This research demonstrated that PRE applications of herbicides other than trifluralin such as pyroxasulfone and prosulfocarb plus S-metolachlor can be safely and effectively used to control rigid ryegrass in no-till wheat.

En Australia, la mayoría del trigo se siembra en un sistema de labranza cero sin cultivo previo donde los herbicidas son aplicados antes de la siembra e incorporados con la sembradora. Trifluralin ha sido el herbicida PRE más ampliamente usado para el control de Lolium rigidum. El objetivo de esta investigación fue determinar la seguridad para el cultivo y la eficacia de herbicidas PRE con mecanismos de acción alternativos para el control de L. rigidum en producción de trigo en labranza cero. Pyroxasulfone alcanzó 98% de control con aplicaciones PRE. Los herbicidas PRE alternativos evaluados solos y en mezclas ocasionalmente resultaron en una reducción significativa en la emergencia del trigo pero no del rendimiento del cultivo. Los tratamientos de trifluralin fallaron en sitios que tenían L. rigidum resistente a trifluralin. Pyroxasulfone y prosulfocarb más S-metolachlor fueron efectivos para controlar L. rigidum en todos los ensayos con un control que fluctuó entre 64 y 94%. Esta investigación demostró que aplicaciones PRE de herbicidas diferentes a trifluralin, tales como pyroxasulfone y prosulfocarb más S-metolachlor pueden ser usados en forma segura y efectiva para el control de L. rigidum en trigo en labranza cero.

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Weed Technology
  • ISSN: 0890-037X
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