Combining control methods is the best form of Canada thistle management. BLM Northwest Regional Noxious … NebGuide: Canada thistle (CIAR4) OK-OSU Extension-Thistles and their Identification (CIAR4) Ohio State University: Identifying noxious weeds (CIAR4) Purdue University: Control practices for Canada thistle (CIAR4) The Nature Conservancy: Wildland Weeds Management & Research Program (CIAR4) UC Davis, IPM: abstract & images (CIAR4) Canada thistle was such a problem that it caused the Canadians to write first weed eradication law in North America: the Canada Thistle Eradication Act of 1865. It is difficult to control because its extensive root system allows it to recover from control attempts. It is adapted to a wide range of soil conditions, and spreads vigorously by wind-borne seeds and by way of its extensive, creeping root system. Managing Canada Thistle Canada thistle (Cirsium arvense) is a perennial that has plagued farmers in America since European settlement, and is a Noxious Weed in Pennsylvania. According to Dr. Harris Steinman, an allergy expert from South Africa, "Russian thistle can cause dermatitis in persons who come into direct contact with it. Clematis spp. Ontario Weeds Act - noxious; Other provinces - noxious in AB, BC, SK, MB, and QC; Canadian Federal Seeds Act - Class 3 ; U.S. Federal Noxious Weed - no Cirsium arvense (CANADA THISTLE); plant may contain toxic levels of nitrates. Claviceps spp. It is native throughout Europe and northern Asia, and widely introduced elsewhere. Hoary Cress 55. Canada thistle develops seed sparingly and may produce 1,000 to 1,500 seeds per flowering shoot. Yellow Starthistle 65. The dermatitis appears to be due only to mechanical irritation from plant floral bracts, which pierce the skin and stimulate an urticarial reaction." A note on "safe" plants: The plants on this list are generally believed to be safe.However, if you suspect that a child (or adult) has eaten quantities of any of these plants (or any of their parts), or if you notice symptoms such as illness or dermatitis after handling these plants, call your Poison Control Center for additional information: (800) 222-1222. Not Your Average Thistle Canada thistle, flowers in South Dakota - Photo by Chris Evans; University of Illinois. Canada thistle is a creeping perennial that reproduces from vegetative buds in its root system and from seed. (ERGOT); an ascomycetous fungus which grows on small grain (e.g., rye); also contains the alkaloid indole. Current Status. Leafy Spurge 59. This highly invasive thistle prevents the coexistence of other plant species through shading, competition for soil resources and possibly through the release of chemical toxins poisonous to other plants. Dalmatian Toadflax 46. Canada Thistle 42. 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