Apr 21

Annual Weeds

Posted on April 21, 2022 at 8:53 AM by Alicia Doran

This time of year landowners are often seeing annual weeds rapidly growing on their property.  One that is being reported is Blue Mustard Chorispora tenella

Find out more at CSU PlantTalk 

Blue mustard by Whitney Cranshaw, Colorado State University, Bugwood.org

Image by Whitney Cranshaw, Colorado State University, Bugwood.org

Dec 03

Don't Move a Pest This Holiday Season

Posted on December 3, 2021 at 1:35 PM by Alicia Doran

Don't Move a Pest

With many of us travelling to different regions this holiday season, we’d like to remind you to not bring home any unexpected “Gifts”.

Invasive pests can easily be moved on vehicles, outdoor equipment and firewood.  By following some simple steps you can prevent introducing unwanted pests to your neighborhood.  When we prevent new pests, we all benefit.

What You Can Do

Don’t Move Firewood - Firewood can harbor many different forest pests.  Use it where you buy it.

Clean Your Equipment - Plant fragments can get caught on your boots or gear.  Cleaning them off before leaving your site will stop them from moving into your area.

Clean Your Vehicles - invasive pests can be carried in soil or attach to the underside of your vehicle so cleaning it before returning home can stop their spread. 

Inspect Outdoor Furniture and Building Materials - Some pests attach themselves to patio furniture, fence posts, lumber, and other materials.  They can easily be moved from one area to the next so inspect before you transport.

Need More Info?

Need More Info?

Jeffco Invasive Species

Jeffco CSU Extension


CO Dept. of Agri.


Sep 29

Vinegar vs. Herbicides

Posted on September 29, 2021 at 8:19 AM by Alicia Doran

Recently on social media sites we have been seeing a lot of people touting the use of Acetic acid (a.k.a. Horticultural Vinegar) as a substitute for 'traditional' herbicides.  Many people are unaware of the truth about Acetic acid and mistakenly think it is the same as the vinegar you put on your salad.

  • Horticultural vinegar is a 20-30% solution of Acetic acid (salad vinegar is 5%)
  • Acetic acid is highly corrosive and can cause severe and permanent eye injuries including blindness.  It also is caustic to skin and can cause long-term respiratory problems.


  • There are some Acetic acid products labeled as herbicides.  Not all sites may be listed on the label.
  • The labels list required personal protective equipment (PPE) including eye protection, N-95 respirators, gloves, long sleeves, long pants, shoes plus socks vs. some traditional herbicides that are less restrictive and may only require long sleeves, long pants, and shoes.
  • The products have a 'Danger' label meaning that they pose a health and/or environmental risk vs. many common herbicides that are lower risk and have a 'Warning' or 'Caution' label. (Yes - Including glyphosate which usually has a Caution label).
  • Some Acetic acid products prohibit reentry into an area (including non-ag sites) for 48 hours.  Most traditional herbicides allow reentry into non-ag sites once the spray has dried.
  • Not all acetic acid products are labeled for herbicide use.  If they are not labeled for herbicide use on your site, it is illegal to use them.

Activity and Effectiveness

  • Acetic acid works best on young, newly emerged annual or biennial plants on warm and sunny days.
  • Acetic acid will kill young foliage but DOES NOT move within the plant.  It is not effective for controlling deep-rooted perennial plants like Canada thistle or Dalmatian toadflax.  While it may damage the leaves, it will not kill the roots and the plants will survive and regrow.

Learn More

University of Maryland