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Figure 2. Several views of Canada thistle (Cirsium arvense). <br />Photo: http://ei.erdc.usace.army.mil/pmis/plants/html/cirsiumO.htmi Available 4 Jan 2006. <br />Efforts to control Canada thistle by treating its top-growth only will not be effective; all control <br />efforts must address the root system instead of or in addition to aboveground measures such as <br />mowing. Canada thistle can recover from almost any stress, including control attempts, be- <br />8