DEPARTMENT OF AGRICULTURE
Conservation Services Division
8 CCR 1206-2
RULES PERTAINING TO THE ADMINISTRATION AND ENFORCEMENT OF THE COLORADO NOXIOUS WEED ACT
Part 4	List B Noxious Weed Species
4.1.	List B of the Colorado noxious weed list comprises the following noxious weed species:
Absinth wormwood (Artemisia absinthium)
Black henbane (Hyoscyamus niger)
Bouncingbet (Saponaria officinalis)
Bull thistle (Cirsium vulgare)
Canada thistle (Cirsium arvense)
Chinese clematis (Clematis orientalis)
Common tansy (Tanacetum vulgare)
Common teasel (Dipsacus fullonum)
Corn chamomile (Anthemis arvensis)
Cutleaf teasel (Dipsacus laciniatus)
Dalmatian toadflax, broad-leaved (Linaria dalmatica)
Dalmatian toadflax, narrow-leaved (Linaria genistifolia)
Dame's rocket (Hesperis matronalis)
Diffuse knapweed (Centaurea diffusa)
Eurasian watermilfoil (Myriophyllum spicatum)
Hoary cress (Cardaria draba)
Houndstongue (Cynoglossum officinale)
Jointed goatgrass (Aegilops cylindrica)
Leafy spurge (Euphorbia esula)
Mayweed chamomile (Anthemis cotula)
Moth mullein (Verbascum blattaria)
Musk thistle (Carduus nutans)
Oxeye daisy (Chrysanthemum leucanthemum)
Perennial pepperweed (Lepidium latifolium)
Plumeless thistle (Carduus acanthoides)
Quackgrass (Elytrigia repens)
Russian knapweed (Acroptilon repens)
Russian-olive (Elaeagnus angustifolia)
Salt cedar (Tamarix chinensis, T. parviflora, and T. ramosissima)
Scentless chamomile (Matricaria perforata)
Scotch thistle (Onopordum acanthium)
Scotch thistle (Onopordum tauricum)
Spotted knapweed (Centaurea maculosa)
Spurred anoda (Anoda cristata)
Sulfur cinquefoil (Potentilla recta)
Venice mallow (Hibiscus trionum)
Wild caraway (Carum carvi)
Yellow nutsedge (Cyperus esculentus)
Yellow toadflax (Linaria vulgaris)
4.2.	List B noxious weed species are species for which the Commissioner, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, develops and implements state noxious weed management plans designed to stop the continued spread of these species. List B species must be managed in accordance with all the provisions of this Part 4, including any applicable state noxious weed management plans. Until a plan for a particular species is developed and implemented by rule, all persons are recommended to manage that species.
4.3.	Local governing bodies and other interested parties are encouraged to make special note of the distribution and abundance of Eurasian watermilfoil, hoary cress, Russian knapweed, and sulfur cinquefoil scentless chamomile, musk thistle, bull thistle, and Scotch thistle as the Commissioner will consult with the state noxious weed advisory committee, local governments, and other interested parties, in order to develop and implement state noxious weed management plans in 2008-2009 2009-2010 designed to stop the continued spread of these species. State noxious weed management plans for additional List B species will be developed in future years.
4.4.	It is a violation of these rules to allow any plant of any population of a List B species designated for eradication by the Commissioner in a state noxious weed management plan (Rules 4.7.1-4.7.9) to produce seed or develop other reproductive propagules after the time specified in the plan for elimination.
4.5.	Prescribed management techniques must be applied to every population of List B species designated for eradication by the Commissioner in a state noxious weed management plan (Rules 4.7.1-4.7.9) to achieve the following objectives:
A.	The plants of every population of List B species designated for eradication must be eliminated prior to seed development in the year specified.
B.	Any population that is discovered in areas designated for eradication subsequent to the year specified for elimination must be eliminated prior to the development of viable seed. If the population is discovered after seed development has occurred, then efforts must be made to minimize the dispersion of seed and elimination is required prior to seed development in the following year.
C.	Once all plants are eliminated, appropriate efforts must be made in subsequent years to detect and eliminate new plants arising from seed, reproductive propagule, or root stock prior to seed development for the duration of the seed longevity for the particular species.
D.	In order to ensure that seeds or other reproductive propagules are not produced or spread, any plant with flowers, seeds, or other reproductive propagules must be placed in sealed plastic bags and disposed of by:
1.	high intensity burning in a controlled environment that completely destroys seed viability;
2.	removal of plant materials to a solid waste landfill which covers refuse daily with six inches of soil or alternative material; or
3.	any other method approved by the Commissioner.
4.6.	Within one year of detection, any local governing body with a population of any List B species for which the Commissioner has developed and implemented a state noxious weed management plan must provide to the State Weed Coordinator mapping data pertinent to distribution and abundance of such species in a form prescribed by the State Weed Coordinator.
4.7.	State Noxious Weed Management Plans for List B Noxious Weed Species
4.7.11	Perennial pepperweed (Lepidium latifolium). In addition to the requirements set forth in this Part 4 for the management of all List B species, the following conditions also apply for perennial pepperweed:
A. 	Elimination of all populations is required prior to seed development in 2009 in all Colorado counties except for Adams, Alamosa, Boulder, Broomfield, Chaffee, Conejos, Costilla, Crowley, Garfield, Gunnison, Huerfano, Jefferson, Larimer, Logan, Mesa, Moffat, Morgan, Pueblo, Rio Grande, Routt, Saguache, and Weld Counties. 
B.	Except as specified in Part 4.7.11V, elimination of all populations in Mesa County is required prior to seed development in 2012.
B C. 	Except as specified in Part 4.7.11U V, elimination of all populations in Adams County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the northern border of Adams County, Longitude 104° 48’34”W and Chambers Road on the east, and the southern and western borders of Adams County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 82).
C D. 	Except as specified in Part 4.7.11U V, elimination of all populations in Alamosa County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the northern border of Alamosa County, Longitude 105° 36’4”W, and the southern and western borders of Alamosa County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 83).
D E. 	Except as specified in Part 4.7.11U V, elimination of all populations in Boulder County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the northern, eastern, and southern borders of Boulder County, and State Highway 93 and US Highway 36 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 84).
E F. 	Except as specified in Part 4.7.11U V, elimination of all populations in Chaffee County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Forest Service Road 255 on the north, a line drawn from northwest to southeast connecting Forest Service Road 255 to the Arkansas River, the Arkansas River, Longitude 105° 58’46”W, Latitude 38° 33’47”N, Longitude 105° 56’16”W, Latitude 38° 30’0”N, and Longitude 106° 7’31”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 85).
F G. 	Except as specified in Part 4.7.11U V, elimination of all populations in Costilla County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Latitude 37° 29’55”N, Longitude 105° 18’48”W, Trinchera Creek on the east to Longitude 105°14’60”W, El Paso Creek and Culebra Creek on the south, State Highway 159, Latitude 37° 22’35”N, and Longitude 105° 29’55”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 86).
G H. 	Except as specified in Part 4.7.11U V, elimination of all populations in Crowley County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the Colorado Canal Corridor and the Bob Creek waterway between the western border of Crowley County and the northern and western shorelines of Lake Meredith with a buffer zone extending ½ mile outward from all waterway edges. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 87).
H I. 	Except as specified in Part 4.7.11U V, elimination of all populations in Gunnison County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Latitude 39° 0’8”N, Longitude 107° 18’47”W, Latitude 38° 52’27”N, and the western border of Gunnison County and of an area demarcated by Latitude 38° 37’36”N, Longitude 106° 52’3”W, Latitude 38° 29’58”N, Longitude 107° 0’0”W, Latitude 38° 26’15”N, and Longitude 107° 3’47”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 88).
I J. 	Except as specified in Part 4.7.11U V, elimination of all populations in Huerfano County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the Huerfano River Watershed from its confluence with Muddy Creek upstream to the Huerfano River Headwaters and of an area demarcated by the Bear Creek Watershed from its confluence with the Cucharas River upstream to the Bear Creek Headwaters. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 89).
J K. 	Except as specified in Part 4.7.11U V, elimination of all populations in Jefferson County is required prior to seed development in 2009 for all land south of Forest Service Road 560, Forest Service Road 211, and 126 Road. For all other land within the County, suppression is the specified State management objective (see Rule 4.8, Figure 90).
K L. 	Except as specified in Part 4.7.11U V, elimination of all populations in Larimer County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Latitude 40° 37’30”N, the eastern and southern borders of Larimer County, and Longitude 105° 7’36”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 91).
L M. 	Except as specified in Part 4.7.11U V, elimination of all populations in Logan County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Cedar Creek on the north, Longitude 103° 15'3"W, North Sterling Canal on the south, and the eastern edge of North Sterling Reservoir and of an area demarcated by State Highway 138 on the north, Longitude 102° 38’23”W to Harmony Ditch, Harmony Ditch and the southern edge of Julesburg Reservoir on the north, the eastern border of Logan County, US Interstate 76, and the southern border of Logan County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 92).
M N. 	Except as specified in Part 4.7.11U V, elimination of all populations in Moffat County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Latitude 40° 52’50”N, Longitude 108° 56’18”W, Latitude 40° 48’47”N, Longitude 108° 48’45”W, Latitude 40° 45’45”N, Longitude 108° 41’12”W, Latitude 40° 41’14”N, and the western border of Moffat County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 93).
N O. 	Except as specified in Part 4.7.11U V, elimination of all populations in Morgan County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the South Platte River corridor including the Fort Morgan Canal and the Sterling Canal from the eastern border of Morgan County upstream to the western border of Morgan County with a ½ mile buffer zone extending from all waterway edges. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 94).
O P. 	Except as specified in Part 4.7.11U V, elimination of all populations in Pueblo County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by the northern border of Pueblo County, Longitude 104° 33’35”W, US Highway 50, the eastern border of Pueblo County, Latitude 38° 3’44”N, Longitude 104° 7’27”W, Latitude 38° 7’37”N, Longitude 104° 18’49”W, Latitude 38° 11’25”N, the Saint Charles River, Longitude 104° 41’20”W, US Highway 50, and US Interstate 25. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 95).
P Q. 	Except as specified in Part 4.7.11U V, elimination of all populations in Rio Grande County is required prior to seed development in 2009 for all land west of Longitude 106° 26’16”W. For all other land within the county, suppression is the specified State management objective (see Rule 4.8, Figure 96).
Q R. 	Except as specified in Part 4.7.11U V, elimination of all populations in Routt County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by Latitude 40° 33’45”N, Longitude 107° 7’29”W, Latitude 40° 29’59”N, and Longitude 107° 15’1”W and of an area demarcated by Latitude 40° 26’13”N, Longitude 107° 7’29”W, Latitude 40° 22’29”N, and Longitude 107° 11’11”W and of an area demarcated by Latitude 40° 26’20”N, Longitude 107° 18’44”W, Latitude 40° 22’32”N, and Longitude 107° 22’28”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 97).
R S. 	Except as specified in Part 4.7.11U V, elimination of all populations in Saguache County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by State Highway 114, US Highway 285, County Road GG, San Luis Creek, the southern border of Saguache County, Longitude 106° 22’29”W, Latitude 37° 52’33”N, and Longitude 106° 14’59”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 98).
S T. 	Except as specified in Part 4.7.11U V, elimination of all populations in Weld County is required prior to seed development in 2009 for all land outside the boundaries of an area demarcated by State Highway 392, State Highway 263, State Highway 37 until it intersects the South Platte River, the South Platte River on the north with a buffer zone extending ½ mile from its northern edge, the eastern border of Weld County, US Highway 34, US Highway 85, and the southern and western borders of Weld County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 99).
T U. 	Except as specified in Part 4.7.11U V, suppression is the State management objective for all populations in Broomfield, Conejos, and Garfield counties.
U V.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2009.
V W.	The prescribed integrated management techniques for the eradication of designated populations are limited to the use of herbicides approved by the Commissioner.
W X.	Prescribed integrated management techniques do not include the use of: (1) any biocontrol agents or; (2) any herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.
X Y.	Seed longevity is estimated to be at least ten years. Infested sites must be monitored for at least ten years after the populations have been eliminated and treatments must be repeated when necessary to prevent flowering and development of seed.
4.7.15 	Venice mallow (Hibiscus trionum). In addition to the requirements set forth in this Part 4 for the management of all List B species, the following conditions also apply for Venice Mallow:
A. 	Elimination of all populations is required prior to seed development in 2011 in Fremont and Larimer Counties.
B.	The prescribed integrated management techniques for the eradication of designated populations are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, sawing, or other mechanical techniques approved by the Commissioner.
C.	Prescribed integrated management techniques do not include the use of: (1) any biocontrol agents or; (2) any herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.
D.	Seed longevity is unknown. Infested sites must be monitored for at least 10 years after the populations have been eliminated and treatments must be repeated when necessary to prevent flowering and development of seed.
4.7.16	Hoary cress (Cardaria draba). In addition to the requirements set forth in this Part 4 for the management of all List B species, the following conditions also apply for hoary cress:
A.	Elimination of all populations is required prior to seed development in 2012 in all Colorado counties except for Adams, Arapahoe, Archuleta, Boulder, Chaffee, El Paso, Fremont, Grand, Kiowa, La Plata, Larimer, Logan, Morgan, Park, Pitkin, Pueblo, Saguache, Summit, and Weld Counties and those counties specified in Part 4.7.16U.
B.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Adams County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Adams County, Longitude 104°42’67”W, and the southern and western borders of Adams County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 149).
C.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Arapahoe County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Arapahoe County, State Highway 88 on the south, and US Highway 85 on the west and of an area demarcated by the northern border of Arapahoe County, West Sand Creek on the east, Latitude 39° 41’13”N, and Watkins Road on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 150).
D.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Archuleta County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 37° 18’45”N, US Highways 160 and 84 on the east, Latitude 37° 11’15”N, Longitude 107°7’29”W, and Martinez Creek on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 151).
E.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Boulder County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern, eastern, and southern borders of Boulder County and Longitude 105° 22’28”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 152).
F.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Chaffee County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 41’15”N, the Arkansas River on the east, Latitude 38° 37’30”N, and Longitude 106° 7’31”W and of an area demarcated by Latitude 38° 33’47”N, State Highway 291 on the east until it intersects with the Arkansas River, the Arkansas River, South Arkansas Creek, and Methodist Mountain Road on the east, Latitude 38° 30’0”N, and Longitude 106° 11’17”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 153).
G.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in El Paso County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by US Highway 24 on the east, Latitude 38° 52’30”N, and the western border of El Paso County and of an area demarcated by Latitude 38° 44’60”N, Jimmy Camp Creek on the east, Little Fountain Creek on the south, and Longitude 104° 45’4”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 154).
H.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Fremont County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 29’59”N, the eastern and southern borders of Fremont County, and Longitude 105° 15’1”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 155).
I.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Grand County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 40° 18’44”N, Longitude 106° 22’30”W, Latitude 40° 11’12”N, and Longitude 106° 29’59”W and of an area demarcated by Latitude 40° 0’1”N, Longitude 106° 18’45”W, the southern border of Grand County, and Longitude 106° 22’32”W and of an area demarcated by the Colorado River on the west, Longitude 106° 30’0”W, and the southern border of Grand County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 156).
J.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Kiowa County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Kiowa County, County Road 72 on the east, County Roads W, 71, and Y on the south, and County Roads 67, AA, and 69 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 157).
K.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in La Plata County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the US Highway 160 on the north, Latitude 37° 18’47”N, the Florida River until it intersects with US Highway 160, US Highway 160 on the North, the eastern and southern borders of La Plata County, and La Plata River and Cherry Creek on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 158).
L.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Larimer County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern, eastern, and southern borders of Larimer County, Longitude 105° 18’42”W, the Big Thompson River, and Longitude 105° 11’17”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 159).
M.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Logan County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by County Road 46 and US Highway 138 on the north, State Highway 55 on the east, Interstate 76 and US Highway 6 on the south, and County Roads 41, 38, 37.5, 42.5, and 37 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 160). 
N.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Morgan County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern and eastern border of Morgan County, US Highways 34 and 6 and Interstate 76 on the south, and the western border of Morgan County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 161).
O.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Park County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 48’55”N, State Highway 9 on the east, County Road 88 and Forest Service Roads 107, 265, and 269 on the south, and Longitude 105° 44’60”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 162).
P.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Pitkin County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Pitkin County, Longitude 106° 48’46”W, Latitude 39° 11’15”N, and Longitude 107° 7’33”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 163).
Q.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Pueblo County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern and eastern borders of Pueblo County, Latitude 38° 7’35”N, and the western border of Pueblo County and of an area demarcated by Latitude 37° 59’58”N, Longitude 104° 45’3”W, the southern border of Pueblo County, and Longitude 104° 52’29”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 164).
R.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Saguache County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Forest Service Roads 852, 862 and 970 and County Road LL57 on the north, Longitude 105° 52’33”W, County Roads CC, 64, and U60 and State Highway 17 on the east, the southern border of Saguache County, Rio Grande Canal on the west until it intersects with US Highway 285, US Highway 285, State Highway 114, and Forest Service Road 852 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 165).
S.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Summit County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Summit County, Longitude 106° 18’45”W, Latitude 39° 52’29”N, and Longitude 106° 23’32”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 166).
T.	Except as specified in Part 4.7.16V and in Part 4.7.16W, elimination of all populations in Weld County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by County Road 74 on the north, the eastern border of Weld County, Interstate 76 and the southern and western borders of Weld County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 167).
U.	Except as specified in Part 4.7.16V and in Part 4.7.16W, s Suppression is the specified State management objective for all populations in Alamosa, Broomfield, Conejos, Delta, Denver, Eagle, Garfield, Gunnison, Jefferson, Mesa, Moffat, Ouray, Rio Grande, and San Miguel Counties.
V.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2012. 
W.	All populations in this state that are within 15 feet of the high water line of any intermittent or perennial stream or river must be eliminated prior to seed development in 2012. 
X.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2012.
Y X.	The prescribed integrated management techniques for the eradication of designated populations are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.
Z Y.	Prescribed integrated management techniques do not include the use of: (1) any biocontrol agents or; (2) any herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.
AA Z.	Seed longevity is estimated to be at least three years. Infested sites must be monitored for at least three years after the populations have been eliminated and treatments must be repeated when necessary to prevent flowering and development of seed.
4.7.17	Russian knapweed (Centaurea repens). In addition to the requirements set forth in this Part 4 for the management of all List B species, the following conditions also apply for Russian knapweed:
A.	Elimination of all populations is required prior to seed development in 2012 in all Colorado counties except for Archuleta, Boulder, Chaffee, Fremont, Jefferson, Kiowa, Larimer, Las Animas, Moffat, Morgan, Ouray, Pitkin, Pueblo, Saguache, and Weld Counties and those counties specified in Part 4.7.17P.
B.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Archuleta County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Forest Service Road 662 on the north, Longitude 106° 56’13”W, and US Highway 84 on the west and of an area demarcated by Latitude 37° 3’48”N, Longitude 107° 18’44”W, and the southern and western borders of Archuleta County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 168).
C.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Boulder County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern, eastern, and southern borders of Boulder County, and US Highway 36 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 169).
D.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Chaffee County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 41’16”N, Longitude 105° 59’60”W, Latitude 38° 33’45”N, Longitude 105° 56’16”W, the eastern border of Chaffee County, Latitude 38° 29’58”N, and Longitude 106° 7’31”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 170).
E.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Fremont County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by US Highway 50 on the north, Longitude 105° 33’42”W, the southern border of Fremont County, and Longitude 105° 37’30”W and of an area demarcated by Tallahassee Creek, US Highway 50, and County Road 441B on the north, Fourmile Creek on the east, Grape Creek on the South, Latitude 38° 22’29”N, and Longitude 105°30’0”W and of an area demarcated by Latitude 38° 30’3”N, the eastern and southern borders of Fremont County, Hardscabble creek on the west, and Longitude 105° 3’46”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 171).
F.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Kiowa County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by County Road U on the north, County Road 33 on the east, County Roads N, 27, and M on the south, and County Roads 25.30, P, and H on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 172).
G.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Larimer County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern, eastern, and southern borders of Larimer County, US Highway 36 on the west, and Longitude 105° 22’33”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 173).
H.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Las Animas County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Van Bremer Arroyo on the north, US Highway 350, County Road 54 on the north, County Roads 107, 48, 107.7, and 107 on the east, County Roads 40 and 40.9 on the south, and Longitude 104° 18’47”N. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 174).
I.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Moffat County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Moffat County, County Road 10N, State Highway 318 until it intersects with the Yampa River, the Yampa River, US Highway 40 on the south, and the western border of Moffat County and of an area demarcated the northern and eastern borders of Moffat County, Elkhead Creek, State Highway 13 and County Road 45 on the east, the southern border of Moffat County, County Roads 51, 32, 55, 17 on the west and US Highway 40, County Roads 7 and 183, and State Highway 13 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 175).
J.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Morgan County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the Riverside Canal on the north until it intersects with State Highway 71, State Highway 71, County Roads EE.00, 34.00, and GG.00 on the north, the eastern border of Morgan County, US Highway 6, Interstate 76, and US Highway 34 on the south, and the western boarder of Morgan County. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 176).
K.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Ouray County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Ouray County, US Highway 550 on the east, State Highway 62 on the south, and Longitude 107° 52’31”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 177).
L.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Pitkin County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Pitkin County, Longitude 106° 48’45”W, Latitude 39° 11’14”N, and Longitude 107° 3’44”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 178).
M.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Pueblo County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 22’33”N, the eastern border of Pueblo County, Latitude 37° 56’14”N, Longitude 104° 30’4”W, Latitude 38° 11’10”N, and the western border of Pueblo County and of an area demarcated by State Highway 165 on the north, Interstate 25 on the east, the southern border of Pueblo County, and Longitude 104° 52’30”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 179).
N.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Saguache County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 15’1”N, Longitude 106° 48’39”W, the southern border of Saguache County, and Longitude 106° 14’58”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 180).
O.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, elimination of all populations in Weld County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by County Road 136 on the north, County Road 105 on the east, County Road 122 on the south, and County Road 390 on the west and of an area demarcated by US Interstate 76 on the north, Market Street, Woodward Avenue and County Road 59 on the east, and State Highway 52 on the south and of an area demarcated by State Highway 52 on the north, US Interstate 25 on the east, and the southern and western borders of Weld County and of an area demarcated by County Road 50 on the north, County Road 17 on the east, County Road 34 on the south, and the western border of Weld County and of an area demarcated by the Cache La Poudre River on the north, US Highway 85 on the east, 37th Street on the south, and 71st street on the west and of an area demarcated by County Road 90 on the north, County Roads 49 and 51 on the east, County Road 74 on the south and Weld County Road 39 on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 181).
P.	Except as specified in Part 4.7.17Q and in Part 4.7.17R, s Suppression is the specified State management objective for all populations in Alamosa, Conejos, Delta, Eagle, Garfield, Gunnison, Jefferson, La Plata, Mesa, Montezuma, Rio Grande, and San Miguel Counties.
Q.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2012. 
R.	All populations in this state that are within 15 feet of the high water line of any intermittent or perennial stream or river must be eliminated prior to seed development in 2012. 
S.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2012.
T S.	The prescribed integrated management techniques for the eradication of designated populations are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.
U T.	Prescribed integrated management techniques do not include the use of: (1) any biocontrol agents or; (2) any herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.
V U.	Seed longevity is estimated to be at least five years. Infested sites must be monitored for at least five years after the populations have been eliminated and treatments must be repeated when necessary to prevent flowering and development of seed.
4.7.18	Sulfur cinquefoil (Potentilla recta). In addition to the requirements set forth in this Part 4 for the management of all List B species, the following conditions also apply for sulfur cinquefoil:
A.	Elimination of all populations is required prior to seed development in 2012 in all Colorado counties except for Larimer, Montrose, Pitkin, and Teller Counties and those counties specified in Part 4.7.18F.
B.	Except as specified in Part 4.7.18G, elimination of all populations in Larimer County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the North Fork Cache La Poudre River on the north, Longitude 105° 33’44”W, Forest Service Road 517 on the south, and Forest Service Road 173 on the west and of an area demarcated by the North Fork of the Big Thompson River on the north, County Road 43 on the east, Longitude 105° 29’58”W, Latitude 40° 18’45”N, and Longitude 105° 33’45”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 182).
C.	Except as specified in Part 4.7.18G, elimination of all populations in Montrose County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 30’0”N, Longitude 108° 7’28”W, Latitude 38° 26’14”N, and Roubideau Creek on the west. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 183).
D.	Except as specified in Part 4.7.18G, elimination of all populations in Pitkin County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by the northern border of Pitkin County, Longitude 106° 56’17”W, Longitude 39° 14’59”N, and Latitude 107° 3’48”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 184).
E.	Except as specified in Part 4.7.18G, elimination of all populations in Teller County is required prior to seed development in 2012 for all land outside the boundaries of an area demarcated by Latitude 38° 48’48”N, the eastern border of Teller County, Longitude 105° 3’43”W, County Roads 8 and 82 on the south, State Highway 67 and Carr Avenue on the south, and Longitude 105° 11’17”W. For all land within these boundaries, suppression is the specified State management objective (see Rule 4.8, Figure 185).
F. 	Except as specified in Part 4.7.18G, s Suppression is the specified State management objective for all populations in Boulder and Jefferson Counties.
G.	All populations in this state that are within 15 feet from the edge of any public road and any immediately adjacent area used for parking must be eliminated prior to seed development in 2012.
H.	The prescribed integrated management techniques for the eradication of designated populations are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.
I.	Prescribed integrated management techniques do not include the use of: (1) any biocontrol agents or; (2) any herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.
J.	Seed longevity is estimated to be at least three years. Infested sites must be monitored for at least three years after the populations have been eliminated and treatments must be repeated when necessary to prevent flowering and development of seed.
4.8.	Figures 1 – 148 185.

Figure 7

Part 5	List C Noxious Weed Species
5.1.	List C of the Colorado noxious weed list comprises the following noxious weed species:
Chicory (Cichorium intybus)
Common burdock (Arctium minus)
Common mullein (Verbascum thapsus)
Common St. Johnswort (Hypericum perforatum)
Downy brome (Bromus tectorum) 
Field bindweed (Convolvulus arvensis)
Halogeton (Halogeton glomeratus)
Johnsongrass (Sorghum halepense)
Jointed goatgrass (Aegilops cylindrica)
Perennial sowthistle (Sonchus arvensis)
Poison hemlock (Conium maculatum)
Puncturevine (Tribulus terrestris)
Puncturevine (Tribulus terrestris)
Redstem filaree (erodium cicutarium)
Velvetleaf (Abutilon theophrasti)
Wild proso millet (Panicum miliaceum)
5.2.	List C noxious weed species are species for which the Commissioner, in consultation with the state noxious weed advisory committee, local governments, and other interested parties, will develop and implement state noxious weed management plans designed to support the efforts of local governing bodies to facilitate more effective integrated weed management on private and public lands. The goal of such plans will not be to stop the continued spread of these species but to provide additional education, research, and biological control resources to jurisdictions that choose to require management of List C species.
Part 7	Statements of Basis, Specific Statutory Authority and Purpose
7.6.	July 16, 2009 – Effective August 30, 2009
Statutory Authority
These amendments to the rules are adopted by the Commissioner of Agriculture pursuant to his authority under the Colorado Noxious Weed Act, §§ 35-5.5-108 and 115, C.R.S. (2008).
Purpose
The purposes of these amendments to the rules are to: (1) develop and implement state noxious weed management plans for selected List B species; (2) revise existing state noxious weed management plans for selected List B species; (3) reclassify one of the currently listed noxious weeds to a different category; (4) eliminate one of the currently listed noxious weeds from one of two categories; and (5) identify priority List B species, among other possible List B species, for which the Commissioner intends to develop and implement state noxious weed management plans.
The proposed amendments to the rules are as follows:
1.	Deletion from Rule 4.3 of the existing language stating that  noxious weed management plans will be developed for Eurasian watermilfoil, Hoary cress, Russian knapweed, and sulfur cinquefoil for 2008 – 2009. 
2.	Addition to Rule 4.3 of new language to establish noxious weed management plans for Eurasian watermilfoil, scentless chamomile, musk thistle, bull thistle, and Scotch thistle for 2009-2010. 
3.	Addition of Mesa County to the list of Colorado counties in Rule 4.7.11A where elimination of Perennial pepperweed is required. 
4.	Addition of a new paragraph B to Rule 4.7.11 to require elimination of all populations of Perennial pepperweed in Mesa County prior to seed development in 2012. 
5.	Addition of new Rule 4.7.16 to establish noxious weed management plans for Hoary cress (Cardaria draba).
6.	Addition of new Rule 4.7.17 to establish noxious weed management plans for Russian knapweed (Centaurea repens).
7.	Addition of new Rule 4.7.18 to establish noxious weed management plans for Sulfur cinquefoil (Potentilla recta). 
8.	Addition of figures 149 to 185 in Rule 4.8 map numbers to reflect the new noxious weed management plans for Hoary cress, Russian knapweed, and Sulfur cinquefoil. 
9.	Deletion of Jointed goatgrass (Aegilops cylindrical) from List C in Rule 5.1.
10.	Addition of Redstem filaree (Erodium cicutarium) to List C in Rule 5.1.
Factual and Policy Issues
The factual and policy issues encountered in the proposal of these amendments to the rules are as follows:
1.	The current rules pertaining to the administration and enforcement of the Colorado Noxious Weed Act state that the Commissioner will develop and implement state noxious weed management plans for selected List B species.
2.	State noxious weed management plans are necessary in order to coordinate appropriate actions at the private, local, state, and federal levels that will halt the continued spread of these List B species.
3.	The proposed plans have been developed in consultation with the state noxious weed advisory committee, local governments, and other interested parties. The proposed plans include weed management plans for Hoary cress (Cardaria draba), Russian knapweed (Centaurea repens), and sulfur cinquefoil (Potentilla recta). 
4.	To maintain the effectiveness of implemented plans, it will be necessary to modify periodically containment boundaries and dates identified for elimination of populations designated for eradication. Dates specified for elimination that expire by 2009 will be reviewed and modified accordingly. 
5.	As per the recommendation of the Colorado Noxious Weed Advisory Committee, the removal of Jointed goatgrass (Aegilops cylindrical) from List C as it has previously been added to List B. 
6. 	As per the recommendation of the Colorado Noxious Weed Advisory Committee, the addition of Redstem filaree (Erodium circutarium) to List C as populations are too numerous in the state to feasibly require elimination.