How is a plant designated as a noxious weed?

As written in the Colorado Noxious Weed Act, a noxious weed is "an alien plant or parts of an alien plant that have been designated by rule as being noxious or has been declared a noxious weed by a local advisory board, and meets one or more of the following criteria: (1) Aggressively invades or is detrimental to economic crops or native plant communities; (2) Is poisonous to livestock; (3) Is a carrier of detrimental insects, diseases, or parasites; (4) The direct or indirect effect of the presence of this plant is detrimental to the environmentally sound management of natural or agricultural ecosystems.” (Colorado Noxious Weed Act, 35-5.5)

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1. What is the Citizen's Weed Advisory Board and what does it do?
2. What is the noxious weed control program?
3. How is noxious weed control enforced?
4. How is a plant designated as a noxious weed?
5. What are some of the costs associated with noxious weeds, and why should I be concerned?