Paraquat-resistant biotypes of Hordeum glaucum from zero-tillage wheat

HM Alizadeh, C Preston, Stephen Powles

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    8 Citations (Scopus)


    There has been a significant increase in the area seeded to minimum-and zero-tilled crops worldwide over the past two decades. These cropping systems rely primarily on the non-selective herbicides glyphosate or paraquat/diquat to control weeds before seeding the crop. Both glyphosate and paraquat/diquat are regarded as low-risk herbicides in the ability of target weeds to develop resistance to them. Following 10-15 years of once annual applications of paraquat and diquat for weed control in zero-tilled cereals, failure of these herbicides to control Hordeum glaucum Steud. in two separate fields occurred. Dose-response experiments demonstrated high-level resistance to paraquat and diquat in both populations; however, the resistant biotypes are susceptible to other herbicides. This is the first report, worldwide, of paraquat resistance following the use of this herbicide in zero-tillage cropping systems and is therefore a harbinger of future problems in minimum-tillage systems when there is exclusive reliance on a contact herbicide for weed control.
    Original languageEnglish
    Pages (from-to)139-142
    JournalWeed Research
    Publication statusPublished - 1998


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