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   Cirsium arvense (herbacée) English     
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         Étude de cas sur les impacts
    Canada English 
    Agricole: Zouhar (2001) states that it is considered one of the most tenacious and economically important agricultural weeds. Nuzzo (2001) states that infestations reduce crop yield through competition for water, nutrients and minerals, and through interference with harvest. In Canada, the major impact is on agricultural land and in natural areas that have been disturbed or are undergoing restoration.
    United States (USA) English 
    Agricole: Thunhorst and Swearingen (1997) report that Cirsium arvense has long been recognized as a major agricultural pest. Nuzzo (2001) states that infestations reduce crop yield through competition for water, nutrients and minerals, and through interference with harvest. It is a host for bean aphid and stalk borer, insects that affect corn and tomatoes, and for sod-web worm (Crampus sp.), which damages corn.

    Compétition: It threatens natural communities by directly competing with and displacing native vegetation, decreasing species diversity, and changing the structure and composition of some habitats (Nuzzo, 1997).

    Économique/Subsistance: Zouhar (2001) states that it is considered one of the most tenacious and economically important agricultural weeds. It presents an economic threat to farmers and ranchers (Nuzzo, 1997), costing tens of millions of dollars in direct crop losses annually and additional millions for control (Thunhorst and Swearingen, 1997).
    Wyoming (United States (USA)) English 
    Autre: Infestations of Cirsium arvense may contribute to the elimination of endangered and/or endemic plant species such as the Colorado butterfly plant in Wyoming (Zouhar, 2001).



ISSG Landcare Research NBII IUCN University of Auckland