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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    Hordeum murinum subsp. leporinum
    diquat
    paraquat
    biotypes
    alfalfa
    herbicides
    fluazifop
    sethoxydim
    grass weeds
    annual weeds
    herbicide resistance
    lethal dose 50
    glyphosate
    dry matter accumulation
    pesticide application
    pastures

    Cite this

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    title = "A BIOTYPE OF HARE BARLEY (HORDEUM-LEPORINUM) RESISTANT TO PARAQUAT AND DIQUAT",
    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.",
    author = "ES Tucker and Stephen Powles",
    year = "1991",
    language = "English",
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    pages = "159--162",
    journal = "Weed Science",
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    A BIOTYPE OF HARE BARLEY (HORDEUM-LEPORINUM) RESISTANT TO PARAQUAT AND DIQUAT. / Tucker, ES; Powles, Stephen.

    In: Weed Science, Vol. 39, 1991, p. 159-162.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - A BIOTYPE OF HARE BARLEY (HORDEUM-LEPORINUM) RESISTANT TO PARAQUAT AND DIQUAT

    AU - Tucker, ES

    AU - Powles, Stephen

    PY - 1991

    Y1 - 1991

    N2 - 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.

    AB - 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.

    M3 - Article

    VL - 39

    SP - 159

    EP - 162

    JO - Weed Science

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