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Integrated Weed Management Recommendations <br /> Integrated weed management is imperative for effective Canada thistle control.This weed needs <br /> to be continually stressed, forcing it to exhaust root nutrient stores, and eventually die. Mowing <br /> or grazing can be followed up with herbicide application.Avoid hand-pulling and tilling which can <br /> stimulate the growth of new plants. <br /> I�r 10 <br /> CULTURAL <br /> Prevention is the best control strategy. Maintain healthy <br /> pastures, riparian areas, and rangelands. Prevent bare ground <br /> caused by overgrazing, and continually monitor your property <br /> for new infestations. Establishment of select grasses can be an <br /> effective control. <br /> BIOLOGICAL <br /> Cattle,goats,and sheep will graze on Canada thistle when plants <br /> are young and succulent in the spring. Follow up grazing with a <br /> a fall herbicide application. Insects are available,and provide limited <br /> control.Currently,collection and distribution methods for Canada <br /> thistle rust(Puccinia puncti formis)are being refined. For more <br /> information on Canada thistle biocontrol,contact the Colorado <br /> Department of Agriculture-Palisade Insectary at <br /> (� (970)464-7916. <br /> VU <br /> Ln 4 MECHANICAL <br /> Due to Canada thistle's extensive root system,hand-pulling <br /> p�j and tilling create root fragments and stimulate the growth of <br /> L new plants. Mowing can be effective if done every io to 21 <br /> days throughout the growing season. Combining mowing with <br /> herbicides will further enhance Canada thistle control. <br /> 'LA CHEMICAL <br /> �� lJ The table below includes recommendations for herbicides that can <br /> L1V be applied to rangeland and some pastures.Treatments may be <br /> necessary for an additional 1 to 3 years because of root nutrient <br /> stores.Always read,understand,and follow the label directions. <br /> Herbicide Rate Application Timing <br /> Aminopyralid* 5-7 oz.product/acre + Apply in spring at the pre-bud growth stage <br /> (Milestone) 0.25%v/v non-ionic until flowering and/or to fall regrowth. Can <br /> surfactant OR 1 also add chlorsulfuron(Telar)at 1 oz./acre to <br /> teaspoon product/gal the mix. <br /> water+0.32 oz./gal <br /> water <br /> Clopyralid+Triclopyr 3 pints product/acre + Apply until flowering and/or fall regrowth. <br /> (Prescott;Redeem; 0.255/6v/v non-ionic <br /> others) surfactant OR 175 oz. <br /> product/gal water+ <br /> 0.32 oz./gal water <br /> Aminocyclopyrachlor+ 5.5 oz.product/acre+ Apply to spring rosette to flower bud growth <br /> chlorsulfuron 0.25%v/v non-ionic stage;or fall.IMPORTANT:Applications <br /> (Perspective)* surfactant greater than 5.5 oz.product/acre exceeds the <br /> threshold for selectivity.DO NOT treat in the <br /> root zone of desirable trees and shrubs.Not for <br /> use on grazed or feed forage. <br /> Note:*Product not permitted for use in_the San Luis Valley._ <br /> Additional herbicide recommendations for this and otherspecies can be foundat <br /> www.colorado.gov/agconservation]CSUHerbi cideRecomme ndati ons.p-4 <br /> Colorado Department of Agriculture-Conservation Services <br /> • 305 Interlocken Parkway <br /> Updated: Broomfield,CO 8o021 <br /> 07/2015 0 (303)869-9030 University <br /> www.colorado.gov/ag/weeds <br />