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    • Journal of Range Management, Volume 37 (1984)
    • Journal of Range Management, Volume 37, Number 2 (March 1984)
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    Control of Leafy Spurge in Pastures Using Dicamba and 2,4-D

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    Author
    Chow, P. N. P.
    Issue Date
    1984-03-01
    
    Metadata
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    Citation
    Chow, P. N. P. (1984). Control of leafy spurge in pastures using dicamba and 2, 4-D. Journal of Range Management, 37(2), 159-162.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/645612
    DOI
    10.2307/3898906
    Additional Links
    https://rangelands.org/
    Abstract
    In the greenhouse, dicamba amine (dimethylamine of 3,6-dichloro-o-anisic acid) at 1.1 and 2.2 kg/ha (a.i.) controlled young seedlings of leafy spurge (Euphorbia escula L.) and prevented shoot formation 66 days after herbicide application. The 2,4-D amine (dimethylamine of 2,4-dichlorophenoxyacetic acid) did not effectively control the growth of leafy spurge at 0.6 and 1.1 kg/ha, but gave good control at 2.2 kg/ha. In a separate test, dicamba at 2.2 kg/ha controlled growth of shoots and roots of 100-day-old stands of leafy spurge more effectively than 2,4-D at the same rate. Dicamba killed mother stands and prevented the production of new shoots, whereas 2,4-D suppressed root growth of mother stands but induced more new shoot growth than found in untreated check plants. In a 5-year (1977-1981) field study (Brandon, Manitoba) of naturally established leafy spurge in a 'Carlton' smooth brome (Bromus inermis Leyss.) pasture, dicamba at 2.2 kg/ha, applied each year from 1977 to 1979, controlled leafy spurge satisfactorily and resulted in increased smooth brome yield. The 2,4-D at 2.2 kg/ha controlled the weed satisfactorily in 1977 and 1979, but not in 1978 and 1981. The mixture of 2,4-D (2.2 kg/ha) and dicamba (1.1 kg/ha) improved weed control and increased smooth brome yield. The smooth brome yield was inversely proportional to leafy spurge control. Under field conditions from 1978 to 1979, 14C-dicamba in the plant translocated to the lower part of stems and accumulated in roots of established leafy spurge more readily than did 14C-2,4-D, measured at 7, 47 and 350 days after herbicide application. It was concluded tht dicamba applied each year gave better spurge control than 2,4-D and resulted in a large yield increase of smooth brome due to killing young seedlings and mother stands. This prevented the spread of root system and seed multiplication of leafy spurge on pasture.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898906
    Scopus Count
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    Journal of Range Management, Volume 37, Number 2 (March 1984)

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