A BIOTYPE OF HARE BARLEY (HORDEUM-LEPORINUM) RESISTANT TO PARAQUAT AND DIQUAT

ES Tucker, Stephen Powles

    Research output: Contribution to journalArticle

    Abstract

    A biotype of the annual grass weed hare barley infesting an alfalfa field with a 24-yr history of the use of the bipyridylium herbicides paraquat and diquat, was investigated for resistance to these herbicides. Rates of up to 800 g ai ha-1 of each herbicide caused no mortality in the hare barley plants from this field. The same species, collected from an adjacent pasture field with no history of bipyridylium herbicide application, exhibited LD50's of 57 and 160 g ai ha-1 for paraquat and diquat, respectively. Tiller numbers and dry matter production in the biotype from the alfalfa field were not affected by the normal rate recommended for both herbicides. These results clearly show that hare barley from the alfalfa field is resistant to paraquat and diquat. Both biotypes were equally sensitive to fluazifop, glyphosate, and sethoxydim.
    Original languageEnglish
    Pages (from-to)159-162
    JournalWeed Science
    Volume39
    Publication statusPublished - 1991

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