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    • Journal of Range Management, Volume 48 (1995)
    • Journal of Range Management, Volume 48, Number 5 (September 1995)
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    Long term change in vegetation following herbicide control of larkspur

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    Author
    Ralphs, M. H.
    Issue Date
    1995-09-01
    Keywords
    matasulfuron
    herbicide residues
    Delphinium occidentale
    snow
    developmental stages
    glyphosate
    herbicide resistance
    non-crop weed control
    Delphinium barbeyi
    herbicides
    rain
    leaf area index
    Idaho
    picloram
    application rates
    botanical composition
    Utah
    canopy
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    Citation
    Ralphs, M. H. (1995). Long term change in vegetation following herbicide control of larkspur. Journal of Range Management, 48(5), 459-464.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644281
    DOI
    10.2307/4002253
    Additional Links
    https://rangelands.org/
    Abstract
    Larkspur (Delphinium spp.) control can reduce cattle deaths on mountain rangelands, but vegetation cover must be maintained to protect watersheds from erosion. The objective of this study was to evaluate the long term impact of herbicides on larkspur control and cover of associated species. Duncecap larkspur (Delphinium occidentale S. Watts) near Oakley Ida., and tall larkspur (D. barbeyi Huth) near Manti Utah, were the target species. Picloram (4-amino-3,5,6-trichloro-2-pyridinecarboxylic acid) was applied at 1.1, 2.2, and 4.5 kg ae/ha; glyphosate (N-(phosphonomethyl)glycine) was applied at 0.06, 1.1, and 2.2 kg ai/ha; and metsulfuron (1-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amine]carbonyl ]amino]sulfonyl]benzoic acid) was applied at 0.035, 0.07, and 0.14 kg ai/ha. Picloram at 2.2 kg/ha maintained long-term control of both larkspur species (> 80%) when applied in the vegetative, bud, and flower growth stages. Total grass cover was higher on picloram plots than other treatments. Forb cover declined and bare ground was greater in picloram plots than other treatments at Manti. Metsulfuron controlled duncecap larkspur when applied in the vegetative stage. However, long-term control of tall larkspur at Manti declined as new tall larkspur seedlings established. Glyphosate controlled both larkspurs when applied in the vegetative and bud stages, but it allowed undesirable annual and rhizomatous forbs and shrubs to increase by the end of the study. Grass cover was lower on glyphosate plots than on other treatments. Bare ground was higher on glyphosate plots than other treatments at Oakley, but was intermediate at Manti.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/4002253
    Scopus Count
    Collections
    Journal of Range Management, Volume 48, Number 5 (September 1995)

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