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Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 7 Mechanical — Due to the extensive root system, hand-pulling this plant is not a viable option. Repeated tillage (every 10 to 14 days) can destroy colonies in 2 to 4 years. Combining mowing with herbicides will further enhance control of this weed. Apply herbicides in spring and/or fall, and then mow during the summer months. Mowing alone is not an effective control option. Chemical/Herbicides—Herbicides that can be applied to range and pasturelands for Hoary Cress are provided on the fact sheet presented in Appendix A. Biological—No known biological control agents available at this time. 3.3 LIST C WEED SPECIES —CONTROL METHODS NOT REQUIRED 3.3.1 Cheatgrass Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of cheatgrass. 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 cheatgrass invasion bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical—Fire,mowing,grazing,tillage,and inter-seeding competitive species have all shown promise in reducing cheatgrass populations. Long lasting control requires a combination of chemical, physical,vegetative suppression and proper livestock management. Chemical/Herbicides —Herbicides that can be applied to range and pasturelands for Cheatgrass are provided on the fact sheet presented in Appendix A. Biological—Biological control is limited. Rabbits and mice will feed extensively on the seedlings as will migratory grasshoppers. But there is no long-term biocontrol agent available. 3.3.2 Field Bindweed Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of field bindweed. 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 field bindweed invasion. Bare spots caused by overgrazing are prime habitat for weed infestations. Mechanical—Cutting, mowing, or pulling has a negligible effect unless the plants are cut below the surface in the early seedling stage. Well-established populations have a large seed bank in the soil that can remain viable for over 40 years. Chemical/Herbicides —Herbicides that can be applied to range and pasturelands for Cheatgrass are provided on the fact sheet presented in Appendix A. Biological — The bindweed gall mite, Aceria mahlerbae, has proven to be effective in reducing field bindweed infestations. Biocontrol agents can be obtained at no charge from the Colorado Department of Agriculture's Insectary(Phone: 970-464-7916 or www.palisadeinsectary.com).