Resources. Successful establishment of rust epidemics and Canada thistle control will be documented and published as scientific articles and technical bulletins for instruction on further implementation by farmers and ranchers. Canada thistle lifecycle and treatment timing graphic For more information on control techniques, visit the Canada thistle factsheet [exit DNR] by University of Wisconsin-Extension. Herbicide Control Please refer to the PNW Weed Management Handbook for information on non-selective and/or non-cropland control of Canada thistle or selective control of Canada thistle in crops or contact your county noxious weed coordinator . New biological control programs are being developed primarily by agencies of the United States Department of Agriculture. Choice of individual control method(s) for Canada thistle depends on Biological control: Two biological control agents have been introduced for Canada thistle control, and a third was introduced accidentally. This exotic disease of musk thistle was introduced from Turkey and released in Virginia in 1987. Two or more applications at 3 to 12 month intervals will be required to provide adequate control. Table 1 summarizes management options for controlling Canada thistle under various situations. There was no change in thistle stem numbers over the study period and no difference in stem numbers in areas of high C. litura populations compared to areas of low C. litura populations. By … A study in Canada showed that when plant growth was prevented for three years, Canada thistle shoots were still observed in the fourth year (Figure 4). Extensive research exists on the effects of Canada thistle [Cirsium arvense (L.) Scop.] Biological Control of Canada Thistle. Palisade Insectary • CDA- part of Conservation Services Download the Invasive Species Council of BC’s Factsheet for Canada Thistle here. The rust causes systemic disease which ultimately kills C. arvense plants. An aggressive and invasive species that can outcompete native plants, Canada thistle is a costly threat to … Our results suggest that insect biological control agents are inadequate for reduction of Canada thistle … More information is needed at this time before these agents can be considered a viable means of control. The Ceutorhynchus litura weevil first was released in North Dakota in the 1970s. Canada Thistle – Integrated Weed Control To Order Call Toll Free 1- 888-319-1632 Or Email Us at iwc@integratedweedcontrol.com Mowing can be done prior to flowering to help reduce seed production and force new growth from the roots. Ceutorhyncus litura is presently used as a control agent in Colorado. Header photo . Several Canada thistle biological control agents have been approved for re-lease in SD by USDA-APHIS-PPQ within the past decade. However, it was included in the extensive surveys of natural enemies of Canada and musk thistle started in Europe in 1961 by the Commonwealth Institute of Biological Control (now CABI Bioscience), funded by Canada Department of Agriculture. Clopyralid STINGER is labeled for selective control of Canada thistle in … The first insect, Canada thistle gall fly (Urophora carduiDiptera: Tephritidae), was released in 1993 at Custer State Park (Helbig, … We supply live biological control insects for the control of Diffuse and Spotted Knapweed, Leafy Spurge, Dalmatian Toadflax and Canada Thistle. Biological Control of Canada Thistle What Was the Need? Canada thistle, Cirsium arvense L., is an aggressive invasive species that is found in the northern United States and not easily controlled by chemical and mechanical methods. Two biological control agents have been introduced for Canada thistle control, and a third was introduced accidentally. 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