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   Cirsium arvense (herb)
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    Details of this species in United States (USA)
    Status: Alien
    Invasiveness: Invasive
    Occurrence: Established
    Source: USDA, NRCS, 2002
    Arrival Date:
    Introduction: Unintentional (accidentally)
    Species Notes for this Location:
    Probably introduced to North America in the 1600s as a contaminant of crop seed and/or ship's ballast.
    Management Notes for this Location:
    C. arvense is classified as a noxious weed.
    Location Notes:
    Agricultural: 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.
    Competition: 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).
    Economic/Livelihoods: 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).
    Last Modified: 18/10/2004 9:45:12 a.m.

ISSG Landcare Research NBII IUCN University of Auckland