Laserfiche WebLink
Pa-e S of 23 Appendix I <br />If a Canada thistle infestation exists in a field that will be rotated to alfalfa, control the weed before seeding <br />alfalfa. Alfalfa is an effective competitor only after it is established. It will not adequately establish in a <br />well-developed Canada thistle infestation. A Canada thistle management system can start with crop or grass <br />competition combined with herbicides. with the field rotated to altalta when the management plan ends. <br />Musk thistle <br />N1anahcment <br />Cultural control of Musk I histi,_ <br />Maintaining pastures and rangeland in good condition is a primary factor liar musk thistle management. `1'0 <br />favor pasture and rangeland grass growth, do not overgra7c. Fertilize only when necessary and according to <br />soil testing recommendations. To successfully managL musk thistle, prevent seed formation. <br />Mechanical control of Musk Thistle <br />Musk thistle will not tolerate tillage and can be removed easily by severing its root below ground with a <br />shovel or hoe. Mowing can effectively reduce seed output if'plants are cut when the terminal head is in the <br />late-flowering stage. Gather and burn stowed debris to destroy any seed that has developed. <br />Chemical Control of Musk "Thistle <br />Several herbicides are registered in pasture, rangeland and noncrop areas to control musk thistle. Tordon <br />22K (picloram), Curtail (clopyralid +2,4-D), Banvel Vanqutsh,C'larity (dicamba), 2,4-D, or <br />Banvel Vanqutsh.,C'larity plus 2,44D are commonly used. Apply these herbicides in spring or fall to musk <br />thistle rosettes. <br />Apply Tordon at 0.5 to I pint per acre (A), Curtail at 2 quarts A. BanvcliVanquish; Clarity at 0.5 to 2 <br />quarts,'A, 2,4-D at 1.5 to 2 quarts/A, or Banvel/Vanqutsh,Clarity plus 2,4-D at 0.5 plus I quart/A. Cool <br />temperatures (below 50 degrees F), particularly in fall, may adversely affect 2,4-D control of musk thistle; <br />therct6rc, use 2,4-D in spring. Tordon is largely unaffected by cool temperatures. Barrel. Vanquish,Clarity <br />can he adversely affected but less than 2.4-D. Ban\cl; Vanquish, Clarity plus 2,4-D work well in spring or <br />tall. Apply any of these herbicides before musk thistle bolts or seed production still tvilI occur.