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  • Jefferson County Weed and Pest Management


    The Jefferson County Weed and Pest Management program helps the public by developing integrated management plans to control mountain pine beetle and noxious weeds. The program, which includes working with the Jefferson County Open Space Natural Resources section, coordinates with other governmental agencies to achieve regional pest control.


    This site includes information to help identify, control and prevent mountain pine beetle and noxious weed infestations. Our goal is to educate the public about weed and pest problems and offer solutions. 



    Common mullein (Verbascum thapsus) is an invasive biennial weed that grows in dry open areas. It reproduces by seed and each plant can produce over 100,000 seeds that can last in the soil for 75-100 years.

    You can control it by removing the plants including the top 2-6 inches of the taproot. Or it can be treated with herbicide. It is common to see patches of seed stalks left over from last year and people will sometimes spend their time removing them while overlooking this year’s rosettes (seedlings). I recommend that you spend your time on the plants that are just starting because most of the seed from last year’s stalks have already dropped. An added benefit is that you do not need to bag the rosettes that have not yet formed flowers.  Learn More

    weed_wom_2015_10_common_mullein_plant  weed_wom_2015_10_common_mullein_rosette



    Pest Alert -  Douglas Fir Tussock Moth

    Douglas fir Tussock Moth populations have increased along the Front Range and are beginning to defoliate Douglas fir and spruce trees in large numbers.

    On February 3rd, we co-hosted an outreach event in Buffalo Creek.  CSFS Forest Entomologist Dan West has kindly allowed us to share his PowerPoint presentation Douglas Fir Tussock Moth OutreachAdobe Reader is required for viewing this document 

    See our DFTM page and our Fact Sheet Adobe Reader is required for viewing this document for more information.


    photo: www.bugwood.org 


    Vertebrate Pest Update - Rats

    With the extra moisture this year has come a heavier population of rats.  Jeffco Environmental Health has information that may help you prevent rats moving onto your property.

    Environmental Health Page


    Play Clean Go


    Recently Jeffco Weed & Pest became a partner with the national Play Clean Go campaign which focuses on preventing the spread of invasive species.

    Learn More


    More Information on Weed and Pest Management in Jeffco

    Noxious Weeds

    Information, Identification and Control, FAQs and Links


    Emerald Ash Borer, Mountain Pine Beetle, Other Pests, Vertebrate Pests, FAQs and Links