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Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 6 ■ Chemical/Herbicides—A variety of herbicide options exist that will control noxious weeds. The active ingredient will vary based on the specific noxious weed species. Information about herbicides can be found on the Crop Data Management Systems, Inc. website(www.cdins.net) and specific specimen labels are available for viewing online. Whichever herbicide you choose to use,remember to read the herbicide label before using the product and follow all directions and precautions. Always read,understand, and follow label directions. The herbicide label is the LAW! Landowners should provide consent for use of chemicals/herbicides prior to application. All contracted professional herbicide applicators must be fully licensed by the Colorado Department of Agriculture. ■ Biological—Not all sites are suitable for biological control. The use of insects will also require some maintenance and considerations for their lifecycle and behavior. Insects can be obtained at no charge from the Colorado Department of Agriculture-Palisade Insectary. Please call(970)464-7916, e-mail: insectarvnstate.co.us, or go to www.palisadeinseciray.com for more information. 3.2 LIST B WEED SPECIES— CONTROL METHODS REQUIRED 3.2.1 Scotch Thistle Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of Scotch thistle.. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to Scotch thistle invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical—Any mechanical or physical method that severs the root below the soil surface will kill Scotch thistle. Mowing or chopping is most effective when Scotch thistle plants are at full bloom. Be sure to properly dispose of the flowering cut plants since seeds can mature and become viable after the plant has been cut down. Chemical/Herbicides—Herbicides that can be applied to range and pasturelands for Scotch thistle are provided on the fact sheet presented in Appendix A. Biological—There are no biological control insects available that will control Scotch thistle. 3.2.2 Hoary Cress Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of hoary cress. Contact your local CSU Extension office or Natural Resources Conservation Service office for seed mix recommendations. Good grazing management will stimulate grass growth and keep pastures healthy. Healthy pastures may be more resistant to hoary cress invasion. Bare spots caused by overgrazing are prime habitat for weed infestations.