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Recommended management methods: <br />Cultural - Establishment of selected, aggressive grasses can be an effective <br />cultural control of Canada 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 Canada thistle invasion. Bare <br />spots caused by overgrazing are prime habitat for weed infestations. <br />Mechanical - Due to the extensive root system, hand -pulling this plant is not a <br />viable option. Mowing can be effective if repeated at about one-month intervals <br />throughout the growing season. Combining mowing with herbicides will further <br />enhance control of this weed. Apply herbicides in spring and/or fall, and then <br />mow during the summer months. <br />Biological -- Canada thistle is typically unpalatable to livestock. Although, cattle <br />have been known to eat the plant when it is in the early growth stages. A gall fly, <br />Urophora cardui, is effective on large infestations and when combined with other <br />control methods. Insects can be obtained at no charge from the Colorado <br />Department of Agriculture. Please call 970-464-797.6 or go to <br />www.palisadeinsectray.com for more information. <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 />Milestone <br />5-7 oz./acre <br />Spring- up to early bud stage and fall rosette stage. Safe hear a <br />or <br />number of trees. Check Iabel for more information. <br />2.5 ml/gal water <br />Add non-ionic surfactant @ 0.32 oz/gal water or <br />1 t/100 gal water. <br />Curtail <br />2-3gts./acre <br />Spring- at 6-10" growth stage to pre -bud and in fall rosette <br />or <br />stage. <br />2.0-2.5 oz/gal water <br />Add non-ionic surfactant @ 0.32 oz/gal water or <br />1 t/100 gal water. <br />Telar XP <br />2 oz/acre <br />Apply from rosette to flower stage when all plants have <br />emerged. <br />Add non-ionic surfactant @ 0.32oz/gal water <br />or 1 t/100 gal water. <br />Clarity + 2,4-D <br />1 qt./acre for each product <br />Spring- early bud stage and fall rosette stage. DO NOT apply <br />Amine <br />or <br />when outside temperatures will exceed 85 degrees. <br />1 oz/gal water for each <br />Add non-ionic surfactant @ 0.32 oz/gal water or <br />_product <br />1 000 al water. <br />