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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. 


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


    photo: www.bugwood.org


    October's Noxious Weed Tips


    Biennial Weeds

    October is a good time to treat your biennial weeds (Musk thistle, Diffuse knapweed, etc) by removing or by spraying with herbicide.  Focus on the new plants (rosettes) that have just newly emerged.  The plants that flowered earlier this year will die so treating them now does not help you.  Sometimes landowners will remove or cut the older plants to allow better contact of herbicides to the new plants. 

    Perennial Weeds

    Treating perennial plants (Canada thistle, leafy spurge, Dalmatian toadflax, etc.) in the fall allows the plants to pull the herbicide into their roots as they move carbohydrates from the leaves. 


    Weed of the Month - October


    Common mullein

    Check out our Weed of the Month page for more information on this noxious weed.


    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