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Recommended management methods: <br /> Cultural-Establishment of selected, aggressive grasses can be an effective <br /> cultural control of Scotch thistle. Contact your local CSU Extension office or <br /> Natural Resources Conservation Service office for seed mix recommendations. <br /> Good grazing management will stimulate grass growth and keep pastures <br /> healthy. Healthy pastures may be more resistant to Scotch thistle invasion. Bare <br /> spots caused by overgrazing are prime habitat for weed infestations. <br /> Mechanical- Any mechanical or physical method that severs the root below the <br /> soil surface will kill Scotch thistle. Mowing or chopping is most effective when <br /> Scotch thistle plants are at full-bloom. Be sure to properly dispose of the <br /> flowering cut plants,since seeds can mature and become viable after the plant <br /> has been cut down. <br /> Biological-There are no biological control insects available that will control <br /> Scotch thistle. <br /> Herbicides- The following are recommendations for herbicides that can be <br /> applied to range and pasturelands. Always read, understand, and follow label <br /> directions. The herbicide label is the LAW! <br /> Herbicide Rate Application Timing/Comments <br /> 2,4-D Amine 1 qt./acre Spring/fall rosette—before flowering stalk lengthens.DO NOT <br /> or apply when outside temperatures will exceed 85 degrees. <br /> 1 oz/gal water Add non-ionic surfactant @ 0.32 oz/gal water or <br /> 1 t/100 gal water. <br /> Curtail 1.5—2 qts./acre Spring rosette to pre-bud stage and/or fall rosette. <br /> or Add non-ionic surfactant @ 0.32 oz/gal water or <br /> 1.5-2.0 oz/gal water 1 t/100 gal water. <br /> Clarity 1 qt./acre Spring rosette—before flowering stalk lengthens and/or late fall <br /> or treatment of rosettes.DO NOT apply near or under trees and/or <br /> 1.0 oz/gal water shrubs or when outside temperatures will exceed 85 degrees. <br /> Add a non-ionic surfactant @ 0.32oz/gal water or 1 gt/100 gal <br /> water. <br /> Milestone 3 to 5 oz/acre Apply to plants in the spring and early summer at rosette or <br /> bolting stage or to the fall rosette.It is permissible to treat <br /> seasonally dry wetlands and transitional areas between upland <br /> and lowland sites.DO NOT rotate to a broadleaf crop within 1 <br /> year of application.Add a non-ionic surfactant @ 0.32oz/gal <br /> water or_l gt/100 gal water. <br /> t <br /> y4yjA 1 }� .s sr n yx .hil�* i s <br /> ¢i }0 11i 4, j <br /> T7, <br /> `4, r , �11��� ���t '' •lrr ` U Ii <br /> ' c" s <br /> i; _-� <br />