Invasive Trees in the Upper South Platte Watershed

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The Colorado Noxious Weed Act directs the Department of Agriculture to develop and implement management plans for all List A and List B noxious weed species. These management plans are regularly reviewed, updated and detailed in the Rules Pertaining to the Administration and Enforcement of the Colorado Noxious Weed Act, or the Noxious Weed Rule for short (8 CCR 1206-2). 

Field data collected annually from County Weed Managers and other state, federal and local agencies and organizations provide the basis for these noxious weed management plans.

List A species are invasive weeds that are either not known to occur in Colorado or are of very limited distribution and are required to be eradicated.

List B species are invasive weeds with populations of varying distribution and densities within the state. The level of mandated control is based on local conditions. These weeds may require eradication within certain areas of the state.

List C species are widespread and common within the state. They may pose a risk to agricultural lands and may be required to be controlled.

Watch List Species that have been determined to pose a potential threat to the agricultural productivity and environmental values of the lands of the state. The Watch List is intended to serve advisory and educational purposes only. Its purpose is to encourage the identification and reporting of these species to the Commissioner in order to facilitate the collection of information to assist the Commissioner in determining which species should be designated as noxious weeds.

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