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Integrated Weed Management Recommendations <br /> The most effective control for Russian knapweed is to prevent its establishment through proper <br /> land management. An integrated weed management approach can be effective when dealing <br /> with Russian knapweed. It can be managed with herbicides or insects, but long-term control must <br /> include planting competitive plant species to occupy bare ground once infested by the weed. <br /> CULTURAL <br /> Maintain healthy pastures and prevent bare spots caused by <br /> overgrazing. Bare ground is prime habitat for weed invasions. <br /> Establishing sod-forming grasses or vegetation with dense shade <br /> can be an effective cultural control of Russian knapweed.Contact <br /> your local Natural Resources Conservation Service for seed mix <br /> recommendations. <br /> BIOLOGICAL <br /> The gall midge,Jaapiella ivannikovi,is a fly that lays eggs in the <br /> shoot tips of Russian knapweed. It forms galls that reduce <br /> d M1 .; C`. •' flowering,seed production,and stunts the plants'growth. This <br /> biocontrol will stress the stand of Russian knapweed but will <br /> not likely eliminate it.The Colorado Department of Agriculture <br /> Palisade Insectary,970-464-7916,is currently establishing this <br /> •., " biocontrol. It is not yet available to the public. <br /> L—�� MECHANICAL <br /> Q Mowing several times before the plants bolt stresses Russian <br /> uv _ knapweed and forces it to use nutrient reserves stored in the root <br /> system. However,mowing alone will not eliminate the infestation <br /> and it can stimulate shoot sprouting the following year.Mowing <br /> p x "'' combined with a fall herbicide application will enhance control. <br /> �,. Tilling and disking can create root fragments that can sprout. <br /> '+-' However,repeated deep tillage(1 feet)over 3 years can kill much <br /> rr <br /> � of the root system. <br /> V <br /> Q CHEMICAL <br /> The following are recommendations for herbicides that can be <br /> applied to range and pasturelands.Always read,understand,and <br /> follow the label directions. Please read label for exact rates. The <br /> n^ herbicide label is the LAW! <br /> Herbicide Rate Application Timing <br /> Aminopyralid' 7 oz.product/acre+ Apply in the fall when above ground stems die back <br /> L..��.1 (Milestone) 0.25%v/v non-ionic and root buds are highly susceptible.Can also <br /> surfactant apply in the bud to senescence stages or in the <br /> spring during early bolt before flower buds form <br /> Aminocyclopyrachlor+ 4-5 oz.product/acre Apply in the fall when above-ground stems die back <br /> Chlorsulfuron +1%v/v methylated and root buds are highly susceptible.Can also <br /> (Perspective)' seed oil apply in the bud to senescence stages or in the <br /> spring during early bolt before flower buds form. <br /> IMPORTANT:Applications greater than 5.5 oz. <br /> product/acre exceeds the threshold for selectivity. <br /> DO NOT treat in the root zone of desirable trees <br /> and shrubs.Not for use on grazed or feed forage. <br /> Not for use on grazed or feed forage. <br /> Note:`Product not permitted for use in the San Luis valley."This herbicide has residual soil <br /> activity that will affect all broadleaf seedlings germinatinig after application has occurred. <br /> Additional herbicide recommendations for this and other species can be found at: <br /> www.colorado.gov/agconse rvation/CSUHerbicide Recommendations.pdf <br /> Colorado Department of Agriculture-Conservation Services <br /> ' 305 Interlocken Parkway <br /> Updated: Broomfield,CO 80021 <br /> 07/2015 (303)869-9030 University <br /> J&4. www.colorado.gov/ag/weeds <br />