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04-22-24-WS
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04-22-24-WS
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GREATjM <br />RIVERlRIPW <br />GREENING <br />Chemical <br />Foliar treat Canada thistle with clopyralid, glyphosate, or triclopyr. Glyphosate can be used for careful <br />spot treatment or when broadcast treating in areas where there is no cover of desirable species. <br />Clopyralid, a broadleaf herbicide for use particularly on members of the Aster and Legume family, is <br />useful for control of Canada thistle where cover of native species is high. Herbicide should be applied <br />during the rosette stage for best results, but can be applied up until flower buds are formed and again in <br />the fall. Repeat treatments are required. Herbicide can also be applied to cut stems for treatment of <br />small areas. It is essential to apply herbicide to each stem that may be connected by rhizomes. Any <br />missed stems will allow the clone to survive. Continued follow-up treatments will be needed. <br />Biological <br />There are biological control agents available for thistle control. However, caution is warranted as the <br />available weevils have been observed feeding on native thistles. <br />Long-term Management <br />Prescribed fire can have mixed results for Canada thistle control and is best used as part of an integrated <br />management program. Using prescribed fire to increase the health and diversity of fire dependent <br />native plant communities is a recommended tactic. <br />Canada Thistle <br />April May June July <br />Aug Sept Oct Nov <br />Dec - <br />Mar <br />Burn <br />Foliar Herbicide <br />Cut Stem Herbicide <br />Mow <br />Don't mow <br />Flowering <br />Bull Thistle (Cirsium vulgare) <br />Description <br />Bull thistle is a biennial herbaceous plant which develops a rosette in the first year and then sends up a <br />3-6 foot flowering stalk the second season. The plant is prickly, with spine -tipped lobes on the leaves <br />and stems with prominent ridges armed with spines. The upper surface of the leaves is rough to the <br />touch. Bull thistle is in the composite or Aster Family, so the purple florets are arranged in dense flower - <br />heads. Seeds with their attached plumes are dispersed by wind and may persist in the seed bank for 10 <br />years or more. Bull thistle readily invades disturbed prairies, as well as low quality pastures, fallow fields, <br />and roadsides. It is readily identifiable in over -stocked pastures where the livestock have grazed around <br />it. It is not a significant problem in high quality natural areas where it cannot easily get a foothold. <br />Mechanical <br />Bull thistles can be cut or mowed prior to their going to seed. If seeds have developed, the plant <br />material should be removed from the site. Severing the tap root as deep as possible with a shovel or <br />parsnip predator can kill the plant. This method can be used for rosettes or flowering plants. <br />
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