8 CCR 1206-2 Part 3 - List A Noxious Weed Species

3.1. List A of the Colorado noxious weed list comprises the following noxious weed species:

African rue (Peganum harmala) [Rule 3.6.1.]

Camelthorn (Alhagi maurorum) [Rule 3.6.2.]

Common crupina (Crupina vulgaris) [Rule 3.6.3.]

Cypress spurge (Euphorbia cyparissias) [Rule 3.6.4.]

Dyer's woad (Isatis tinctoria) [Rule 3.6.5.]

Elongated mustard (Brassica elongata) [Rule 3.6.18.]

Flowering rush (Butomus umbellatus) [Rule 3.6.24]

Giant reed (Arundo donax) [Rule 3.6.19.]

Giant salvinia (Salvinia molesta) [Rule 3.6.6.]

Hairy willow-herb (Epilobium hirsutum) [Rule 3.6.23]

Hydrilla (Hydrilla verticillata) [Rule 3.6.7.]

Japanese knotweed (Fallopia japonica) [Rule 3.6.20.]

Giant knotweed (Fallopia sachalinense) [Rule 3.6.21.]

Bohemian knotweed (Fallopia x bohemicum) [Rule 3.6.22.]

Meadow knapweed (Centaurea x moncktonii) [Rule 3.6.8.]

Mediterranean sage (Salvia aethiopis) [Rule 3.6.9.]

Medusahead (Taeniatherum caput-medusae) [Rule 3.6.10.]

Myrtle spurge (Euphorbia myrsinites) [Rule 3.6.11.]

Orange hawkweed (Hieracium aurantiacum) [Rule 3.6.12.]

Parrotfeather (Myriophyllum aquaticum) [Rule 3.6.25]

Purple loosestrife (Lythrum salicaria) [Rule 3.6.13.]

Rush skeletonweed (Chondrilla juncea) [Rule 3.6.14.]

Squarrose knapweed (Centaurea virgata) [Rule 3.6.15.]

Tansy ragwort (Senecio jacobaea) [Rule 3.6.16.]

Yellow starthistle (Centaurea solstitialis) [Rule 3.6.17.]

3.2. All populations of List A species in Colorado are designated by the Commissioner for eradication.

3.3. It is a violation of these rules to allow any plant of any population of any List A species to produce seed or develop other reproductive propagules.

3.4. Prescribed management techniques must be applied to every population of List A noxious weeds present in Colorado to achieve the following objectives:

3.4.1. The plants of every population of List A species must be eliminated prior to seed development.

3.4.2. Once all mature plants are eliminated, appropriate efforts must be made to detect and eliminate new plants arising from seed, reproductive propagule, or root stock for the duration of the seed longevity for the particular species.

3.4.3. 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:

3.4.3.1. High intensity burning in a controlled environment that completely destroys seed viability;

3.4.3.2. Removal of plant materials to a solid waste landfill which covers refuse daily with six inches of soil or alternative material; or

3.4.3.3. Any other method approved by the Commissioner.

3.5. Within one year of detection, any local governing body with a population of any List A species must provide to the State Weed Coordinator mapping data in a form prescribed by the Commissioner, pertinent to each population including, but not limited to:

3.5.1. Species name

3.5.2. Population location(s) including distribution and measure of abundance (e.g., percent cover, total number of plants, density per unit area)

3.5.3. Estimated infested acreage

3.6. State Noxious Weed Management Plans for List A Noxious Weed Species

3.6.1. African rue (Peganum harmala). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for African rue:

3.6.1.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and digging or other mechanical techniques approved by the Commissioner.

3.6.1.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.1.3. Seed longevity is unknown.

3.6.2. Camelthorn (Alhagi maurorum). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for camelthorn:

3.6.2.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and digging or other mechanical techniques approved by the Commissioner.

3.6.2.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.2.3. Seed longevity is at least several years.

3.6.3. Common crupina (Crupina vulgaris). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for common crupina:

3.6.3.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.3.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.3.3. Seed longevity is three years.

3.6.4. Cypress spurge (Euphorbia cyparissias). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for cypress spurge:

3.6.4.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.4.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.4.3. Seed longevity is estimated to be eight years.

3.6.5. Dyer's woad (Isatis tinctoria). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for dyer's woad:

3.6.5.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.5.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.5.3. Seed longevity is at least eight years.

3.6.6. Giant salvinia (Salvinia molesta). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for giant salvinia:

3.6.6.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, water drawdown (controlled water drainage), and hand-removal or other mechanical techniques approved by the Commissioner.

3.6.6.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.6.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.6.4. Spore longevity is negligible.

3.6.7. Hydrilla (Hydrilla verticillata). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for hydrilla:

3.6.7.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, water drawdown (controlled water drainage), and hand-removal or other mechanical techniques approved by the Commissioner.

3.6.7.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.7.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered reproductive propagules.

3.6.7.4. Seed longevity is unknown.

3.6.8. Meadow knapweed (Centaurea x moncktonii). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for meadow knapweed:

3.6.8.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.8.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.8.3. Seed longevity is estimated to be at least seven years.

3.6.9. Mediterranean sage (Salvia aethiopis). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for Mediterranean sage:

3.6.9.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and digging or other mechanical techniques approved by the Commissioner.

3.6.9.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.9.3. Seed longevity is unknown.

3.6.10. Medusahead (Taeniatherum caput-medusae). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for medusahead:

3.6.10.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, prescribed fire in conjunction with herbicide application, and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.10.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.10.3. Seed longevity is at least two years.

3.6.11. Myrtle spurge (Euphorbia myrsinites). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for myrtle spurge:

3.6.11.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.11.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.11.3. Seed longevity is estimated to be eight years.

3.6.12. Orange hawkweed (Hieracium aurantiacum). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for orange hawkweed:

3.6.12.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner.

3.6.12.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.12.3. Seed longevity is estimated to be eight years.

3.6.13. Purple loosestrife (Lythrum salicaria). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for purple loosestrife:

3.6.13.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.13.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.13.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.13.4. Seed longevity is unknown but at least ten years.

3.6.14. Rush skeletonweed (Chondrilla juncea). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for rush skeletonweed:

3.6.14.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.14.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.14.3. Seed longevity is at least three years.

3.6.15. Squarrose knapweed (Centaurea virgata). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for squarrose knapweed:

3.6.15.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, prescribed fire in conjunction with herbicide application, and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.15.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.15.3. Seed longevity is at least three years.

3.6.16. Tansy ragwort (Senecio jacobaea). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for tansy ragwort:

3.6.16.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.16.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.16.3. Seed longevity is at least sixteen years.

3.6.17. Yellow starthistle (Centaurea solstitialis). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for yellow starthistle:

3.6.17.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, prescribed fire in conjunction with herbicide application, and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.17.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.17.3. Seed longevity is at least ten years.

3.6.18. Elongated mustard (Brassica elongata). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for elongated mustard:

3.6.18.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.18.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.18.3. Seed longevity is unknown. 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.

3.6.19. Giant reed (Arundo donax). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for giant reed:

3.6.19.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.19.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.19.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.19.4. Seed longevity is unknown. 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.

3.6.20. Japanese knotweed (Fallopia japonica). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for Japanese knotweed:

3.6.20.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.20.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.20.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.20.4. Seed longevity is unknown. 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.

3.6.21. Giant knotweed (Fallopia sachalinense). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for giant knotweed:

3.6.21.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.21.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.21.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.21.4. Seed longevity is unknown. 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.

3.6.22. Bohemian knotweed (Fallopia x bohemicum). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for Bohemian knotweed:

3.6.22.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.22.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.22.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered plant propagules.

3.6.22.4. Seed longevity is unknown. 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.

3.6.23. Hairy willow-herb (Epilobium hirsutum). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for hairy willow-herb:

3.6.23.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner and hand-pulling, digging, or other mechanical techniques approved by the Commissioner.

3.6.23.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.23.3. Seed longevity is unknown. 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.

3.6.24. Flowering rush (Butomus umbellatus). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for flowering rush:

3.6.24.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, water drawdown (controlled water drainage), and hand-removal or other mechanical techniques approved by the Commissioner.

3.6.24.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.24.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered reproductive propagules.

3.6.24.4. Seed longevity is unknown. Reproduction by seed is rare; most plants are sterile. 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 reproduction.

3.6.25. Parrotfeather (Myriophyllum aquaticum). In addition to the requirements set forth in this Part 3 for the management of all List A species, the following conditions also apply for parrotfeather:

3.6.25.1. The prescribed integrated management techniques are limited to the use of herbicides approved by the Commissioner, water drawdown (controlled water drainage), and hand-removal or other mechanical techniques approved by the Commissioner.

3.6.25.2. Prescribed integrated management techniques do not include the use of any biocontrol agents, herbicides, cultural techniques, or mechanical techniques other than those approved by the Commissioner.

3.6.25.3. Any efforts to physically remove plants must prevent fragmentation as stem fragments are considered reproductive propagules.

3.6.25.4. Seed longevity is unknown. Reproduction by seed is rare; seeds are seldom encountered outside its native range. 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 reproduction.

Notes

8 CCR 1206-2 Part 3

40 CR 05, March 10, 2017, effective 3/30/2017 41 CR 05, March 10, 2018, effective 3/30/2018 43 CR 19, October 10, 2020, effective 10/30/2020 46 CR 08, April 25, 2023, effective 5/15/2023