RESISTANCE TO ARYLOXYPHENOXYPROPIONATE HERBICIDES IN 2 WILD OAT SPECIES (AVENA-FATUA AND AVENA-STERILIS SSP LUDOVICIANA)

AM Mansooji, JA Holtum, P Boutsalis, JM Matthews, Stephen Powles

    Research output: Contribution to journalArticle

    Abstract

    Resistance to the methyl ester of diclofop, an aryloxyphenoxypropionate graminicide, was shown for a wild oat (Avena fatua) population from Western Australia, and marked resistance to a range of aryloxyphenoxypropionate and cyclohexanedione graminicides was detected in a winter wild oat (Avena sterilis ssp. ludoviciana) population from South Australia. The A. sterilis biotype exhibited high levels of resistance to the aryloxyphenoxypropionate herbicides diclofop, fluazifop, haloxyfop, fenoxaprop, quizalofop, propaquizafop, and quinfurop and low levels of resistance to the cyclohexanedione herbicides sethoxydim, tralkoxydim, and cycloxydim. Ratios of LD50 values for responses of resistant and susceptible A. sterilis to the aryloxyphenoxypropionate herbicides were between 20 for propaquizafop and > 1,000 for fluazifop, and were between 2.5 and 3 for the cyclohexanedione herbicides. The LD50 value for diclofop for the A. fatua biotype was 442 g ai ha-1 which was 2.7-fold that of a susceptible control. Thirty-three percent of the plants survived at the registered rate of application.
    Original languageEnglish
    Pages (from-to)599-605
    JournalWeed Science
    Volume40
    Publication statusPublished - 1992

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