Virginia Tech Weed Identification Guide. Tilling Canada thistle will spread the plants by root pieces, but repeated tilling Biological control insects for Canada thistle are commercially available, but Canada thistle control results have been variable and the insects' impacts on native thistles have not been thoroughly tested. To prevent future Canada thistle invasions, routinely fertilize your lawn (4 times per year) to keep it so thick and lush that there’s simply no room for weeds. Canada Thistle Control. The greater control of Canada thistle with Tordon in these two studies may be explained by the persistence and mobility of … Canada thistle (Cirsium arvense) [exit DNR]. Legal Status: Prohibited - Control Efforts must be made to prevent seed maturation and dispersal of plants into new areas. Canada thistle is more difficult to control manually because of its creeping root system. Its deep roots are the real issue. Links for more information: Canada thistle shoots are relatively easy to kill with herbicides, it's the extensive root system that makes the weed so difficult to bring under control. Common Name: Canada Thistle Scientific Name: Cirsium arvense (L.) Scop. Canada thistle is the only thistle in North Dakota that has become a cropland pest. Last updated Nov. 5, 2003. The seeds of this broadleaf perennial can go dormant for up to 20 years 2, but only about 10% of Canada thistle is spread through seed 1. To control Canada thistle, use Roundup® For Lawns 1 Ready-To-Use to spot treat plants as they appear. Two years before confederation, legislation required farmers to cut the weed 1. Conservation Easement Management: The window is short for spot spraying and it can be hampered by the large areas of dead vegetation that blocks ones view of the small plants at their most vulnerable point. Researchers with Agriculture and Agri-Food Canada (AAFC) at … Hadroplontus litura, or the Canada thistle stem weevil, is a biological control agent that attacks Canada thistle by larval feeding within the stem, opening the plant up for secondary damage from other organisms such as opportunistic pathogens. A problem perennial weed in many cropping systems, Canada thistle, has consistently ranked in the top five weeds in the Canadian Prairies in relative abundance. Repeated mowings when the plant has tight flower buds can help decrease the number of plants. In pastures, Canada thistle is a deterrent to grazing because cattle avoid eating the spiny leaves. Herbicide control of Canada thistle is most effective when you apply the herbicide in spring (April, May or June) or fall (September or October). McClay, A.S. Canada thistle In: Van Driesche, R., et al., 2002, Biological Control of Invasive Plants in the Eastern United States, USDA Forest Service Publication FHTET-2002-04, 413 p [exit DNR]. Additionally, no transportation, propagation, or sale of these plants is allowed. To optimize perennial broadleaf weed control, herbicide selection and use must be co-ordinated with crop rotations and cropping practices over the long term. Hadroplontus litura. In fact, Canada thistle is older than Canada itself. 2018 Information. Canada thistle can displace endangered or threatened plant species. Grazing Canada thistle with goats is a control option because goats tolerate and often prefer spiny, tough fodder that other livestock reject. The best approach to Canada thistle control in cropland should include an in-crop herbicide treatment to suppress Canada thistle growth, minimize crop yield losses and prepare the thistle for a fall postharvest treatment. 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