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   Cirsium arvense (herbacée) English 
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    Détails de cette espèce dans Canada
    Statut: Non indiqué
    Statut d'envahissement: Non indiqué
    Occurrence: Signalé(e)
    Source: Zouhar, 2001
    Date d'introduction:
    Mode d'Introduction: Involontaire (accidentellement)
    Notes sur l'espèce pour cette localité:
    Probably introduced to North America in the 1600s as a contaminant of crop seed and/or ship's ballast.
    Notes sur la gestion de l'espèce dans cette localité:
    Notes sur la localité:
    Canada thistle is listed as a noxious weed in 7 Canadian provinces.
    Impacts:
    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.
    Dernière mise à jour: 15/02/2004 4:11:04 p.m.


ISSG Landcare Research NBII IUCN University of Auckland