CHLOROACETAMIDE RESISTANCE IN RIGID RYEGRASS (LOLIUM-RIGIDUM)

MWM Burnet, AR Barr, Stephen Powles

    Research output: Contribution to journalArticle

    22 Citations (Scopus)

    Abstract

    Metolachlor has been evaluated both as a herbicide for use in cultivated oats (Avena sativa L.) and for its potential as an alternative herbicide for the control of herbicide-resistant rigid ryegrass. Eight herbicide-resistant and two susceptible biotypes of rigid ryegrass were tested for their susceptibility to metolachlor. Response to metolachlor was determined both in soil and an agar germination medium. The LD50 for metolachlor in agar for a susceptible biotype (VLR1) was 0.13 muM. Five biotypes, SLR5 (6.9 fold), SLR31 (5.2 fold), SLR10 (2.5 fold), NLR12 (2.1 fold) and VLR69 (1.9 fold), were cross-resistant to metolachlor when compared with VLR1. Relative response of the biotypes was similar in both soil and agar, validating the use of an agar germination test to determine the susceptibility of rigid ryegrass biotypes to metolachlor. Biotypes cross-resistant to metolachlor also were cross-resistant to alachlor (SLR5 6.7 fold, SLR31 5.9 fold, SLR10 2.4 fold, and VLR69 1.6 fold with the LD50 for VLR1 being 0.49 muM) and propachlor (SLR5 7.2 fold, SLR31 7.2 fold, SLR10 3.0 fold and VLR69 2.5 fold with the LD50 for VLR1 being 0.47 muM) indicating that cross-resistance extends to other members of the chloroacetamide group. Cross-resistance to chloroacetamides was observed in-biotypes that previously had been reported as cross-resistant to other herbicides. In contrast, biotypes with limited herbicide histories were generally not cross-resistant to metolachlor. These results indicate that there is a high probability of chloroacetamide cross-resistance in populations of herbicide-resistant rigid ryegrass.
    Original languageEnglish
    Pages (from-to)153-157
    JournalWeed Science
    Volume42
    Publication statusPublished - 1994

    Fingerprint

    Lolium rigidum
    metolachlor
    biotypes
    Lolium
    herbicides
    Chrysanthemum morifolium
    cross resistance
    agar
    lethal dose 50
    propachlor
    germination
    alachlor
    Avena sativa
    oats
    soil
    history

    Cite this

    Burnet, MWM ; Barr, AR ; Powles, Stephen. / CHLOROACETAMIDE RESISTANCE IN RIGID RYEGRASS (LOLIUM-RIGIDUM). In: Weed Science. 1994 ; Vol. 42. pp. 153-157.
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    title = "CHLOROACETAMIDE RESISTANCE IN RIGID RYEGRASS (LOLIUM-RIGIDUM)",
    abstract = "Metolachlor has been evaluated both as a herbicide for use in cultivated oats (Avena sativa L.) and for its potential as an alternative herbicide for the control of herbicide-resistant rigid ryegrass. Eight herbicide-resistant and two susceptible biotypes of rigid ryegrass were tested for their susceptibility to metolachlor. Response to metolachlor was determined both in soil and an agar germination medium. The LD50 for metolachlor in agar for a susceptible biotype (VLR1) was 0.13 muM. Five biotypes, SLR5 (6.9 fold), SLR31 (5.2 fold), SLR10 (2.5 fold), NLR12 (2.1 fold) and VLR69 (1.9 fold), were cross-resistant to metolachlor when compared with VLR1. Relative response of the biotypes was similar in both soil and agar, validating the use of an agar germination test to determine the susceptibility of rigid ryegrass biotypes to metolachlor. Biotypes cross-resistant to metolachlor also were cross-resistant to alachlor (SLR5 6.7 fold, SLR31 5.9 fold, SLR10 2.4 fold, and VLR69 1.6 fold with the LD50 for VLR1 being 0.49 muM) and propachlor (SLR5 7.2 fold, SLR31 7.2 fold, SLR10 3.0 fold and VLR69 2.5 fold with the LD50 for VLR1 being 0.47 muM) indicating that cross-resistance extends to other members of the chloroacetamide group. Cross-resistance to chloroacetamides was observed in-biotypes that previously had been reported as cross-resistant to other herbicides. In contrast, biotypes with limited herbicide histories were generally not cross-resistant to metolachlor. These results indicate that there is a high probability of chloroacetamide cross-resistance in populations of herbicide-resistant rigid ryegrass.",
    author = "MWM Burnet and AR Barr and Stephen Powles",
    year = "1994",
    language = "English",
    volume = "42",
    pages = "153--157",
    journal = "Weed Science",
    issn = "0043-1745",
    publisher = "Cambridge University Press",

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    CHLOROACETAMIDE RESISTANCE IN RIGID RYEGRASS (LOLIUM-RIGIDUM). / Burnet, MWM; Barr, AR; Powles, Stephen.

    In: Weed Science, Vol. 42, 1994, p. 153-157.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - CHLOROACETAMIDE RESISTANCE IN RIGID RYEGRASS (LOLIUM-RIGIDUM)

    AU - Burnet, MWM

    AU - Barr, AR

    AU - Powles, Stephen

    PY - 1994

    Y1 - 1994

    N2 - Metolachlor has been evaluated both as a herbicide for use in cultivated oats (Avena sativa L.) and for its potential as an alternative herbicide for the control of herbicide-resistant rigid ryegrass. Eight herbicide-resistant and two susceptible biotypes of rigid ryegrass were tested for their susceptibility to metolachlor. Response to metolachlor was determined both in soil and an agar germination medium. The LD50 for metolachlor in agar for a susceptible biotype (VLR1) was 0.13 muM. Five biotypes, SLR5 (6.9 fold), SLR31 (5.2 fold), SLR10 (2.5 fold), NLR12 (2.1 fold) and VLR69 (1.9 fold), were cross-resistant to metolachlor when compared with VLR1. Relative response of the biotypes was similar in both soil and agar, validating the use of an agar germination test to determine the susceptibility of rigid ryegrass biotypes to metolachlor. Biotypes cross-resistant to metolachlor also were cross-resistant to alachlor (SLR5 6.7 fold, SLR31 5.9 fold, SLR10 2.4 fold, and VLR69 1.6 fold with the LD50 for VLR1 being 0.49 muM) and propachlor (SLR5 7.2 fold, SLR31 7.2 fold, SLR10 3.0 fold and VLR69 2.5 fold with the LD50 for VLR1 being 0.47 muM) indicating that cross-resistance extends to other members of the chloroacetamide group. Cross-resistance to chloroacetamides was observed in-biotypes that previously had been reported as cross-resistant to other herbicides. In contrast, biotypes with limited herbicide histories were generally not cross-resistant to metolachlor. These results indicate that there is a high probability of chloroacetamide cross-resistance in populations of herbicide-resistant rigid ryegrass.

    AB - Metolachlor has been evaluated both as a herbicide for use in cultivated oats (Avena sativa L.) and for its potential as an alternative herbicide for the control of herbicide-resistant rigid ryegrass. Eight herbicide-resistant and two susceptible biotypes of rigid ryegrass were tested for their susceptibility to metolachlor. Response to metolachlor was determined both in soil and an agar germination medium. The LD50 for metolachlor in agar for a susceptible biotype (VLR1) was 0.13 muM. Five biotypes, SLR5 (6.9 fold), SLR31 (5.2 fold), SLR10 (2.5 fold), NLR12 (2.1 fold) and VLR69 (1.9 fold), were cross-resistant to metolachlor when compared with VLR1. Relative response of the biotypes was similar in both soil and agar, validating the use of an agar germination test to determine the susceptibility of rigid ryegrass biotypes to metolachlor. Biotypes cross-resistant to metolachlor also were cross-resistant to alachlor (SLR5 6.7 fold, SLR31 5.9 fold, SLR10 2.4 fold, and VLR69 1.6 fold with the LD50 for VLR1 being 0.49 muM) and propachlor (SLR5 7.2 fold, SLR31 7.2 fold, SLR10 3.0 fold and VLR69 2.5 fold with the LD50 for VLR1 being 0.47 muM) indicating that cross-resistance extends to other members of the chloroacetamide group. Cross-resistance to chloroacetamides was observed in-biotypes that previously had been reported as cross-resistant to other herbicides. In contrast, biotypes with limited herbicide histories were generally not cross-resistant to metolachlor. These results indicate that there is a high probability of chloroacetamide cross-resistance in populations of herbicide-resistant rigid ryegrass.

    M3 - Article

    VL - 42

    SP - 153

    EP - 157

    JO - Weed Science

    JF - Weed Science

    SN - 0043-1745

    ER -