Colorado Noxious Weed List B

According to Colorado Department of Agriculture Colorado noxious weed list B includes “invasive species that are common enough in parts of the state that eradication is not feasible. The species are still recommended for eradication, suppression, or containment depending on distribution and densities around the state.”

Examples of Colorado Noxious weed list B:

•Absinth wormwood
•Black henbane
•Bouncingbet
•Bull thistle
•Canada thistle
•Chamomile
•Chinese clematis
•Common tansy
•Common teasel
•Dalmatian toadflax
•Dames rocket
•Diffuse knapweed
•Eurasian watermilfoil
•Hoary cress
•Houndstongue
•Jointed goatgrass
•Leafy spurge
•Moth mullein
•Musk thistle
•Oxeye daisy
•Perennial pepperweed
•Plumeless thistle
•Quackgrass
•Russian knapweed
•Russian-olive
•Slat cedar
•Scotch thistle
•Spotted knapweed
•Spurred anoba
•Sulfur cinquefoil
•Venice mallow
•Wild caraway
•Yellow nutsedge
•Yellow toadflax

Check the Colorado Department of Agriculture for updates of the state weed law and listed weed species.

A lot of these weeds are very aggressive and present a problem for pastures, rangeland, and right-of-way. They outcompete native species. They have vigorous root systems or can produce thousands of seeds that can stay in soil for years. Some of them can be poisonous to livestock. For Example, Russian knapweed is poisonous to horses. If unmanaged, these weeds can cause a serious decline in desirable vegetation.

Early detection and prompt control is the key to managing Colorado noxious weed list B. Areas should be monitored several times a year for signs of weed infestation. For best results you should utilize several methods of Integrated Pest Management control:
1.Revegetation – establishing a dense, competitive vegetation to replace weeds
2.Managed grazing – controlled grazing with goats or sheep
3.Biological control- releasing living organisms (insects, animals, and pathogens) to control undesirable vegetation
4.Cultural control- reduction of pest population through changes in management practices or avoiding situations that favor an increase in pest numbers
5.Physical and mechanical control – hand pulling, mowing, sanitation, tillage operations
6.Chemical control

If you have problems with Colorado noxious weed list B, we recommend you take immediate actions to take control of these weeds and prevent further infestation. Contact SprayTech to find out about our weed spraying services and how we can help you fight against invasive species.