Douglas County Weed Management

Welcome to the Douglas County Weed Management Website.


The Pacific Northwest Weed Management Handbook, "Control of Problem Weeds" page has been updated!  This website give information regarding specific weeds that may be troublesome to control. Herbicides and/or rates listed cannot necessarily be used on cropland. Rates of application and restrictions vary depending on crop or site. Do not apply to a crop or site not listed on the label.

Control of Problem Weeds

In October 2004, Douglas County Commissioners activated the Douglas County Weed Management Task Force and appointed nine individuals who geographically represent Douglas County agriculture and urban areas. Margaret Viebrock, WSU Extension, was appointed to facilitate this committee and help to develop weed management strategies.

Ex-officio members of this Task Force include representatives from Douglas County Transportation and Land Services, Foster Creek Conservation District, Douglas County Commissioners and WSU Extension.

Task Force Directives (defined by the Douglas County Commissioners)

  • Develop a communication system with all entities that have weed control programs.
  • Gain a better understanding of weed control methods used by other other entities.
  • Design a system to coordinate weed control efforts.
  • Continue the process of developing an informed educational approach to weed management in Douglas County.
  • Engage landowners and agencies in a cooperative weed management program.


Since the appointment of the Douglas County Weed Management Task Force, the committee has taken a proactive approach to learn about various weed management programs. Members have met with agency people, integrated weed management program managers, state weed board representatives, county noxious weed control managers and other groups who manage weeds. The best parts of these programs have been integrated into the local plan of work. Members have also spent time in Olympia with state legislative groups explaining how the program has been successful in Douglas County.



Seedhead flower plant

Puncturevine Facts

  • Douglas County Class B weed.
  • This prostrate annual biennial was introduced from southern Europe and is now widely scattered over much of the U.S.
  • Leaves grow opposite of each other and have 4 to 8 pairs of leaflets, each about ¼ to ½ inch long and oval.
  • Mature plants have numerous trailing stems that grow outward from a central location thus creating a dense carpet-like mat. Stems can reach lengths greater than 6 feet.
  • Flowers are yellow and consist of 5 petals and are borne solitary on short stalks in the leaf axils.
  • Flowering occurs from July to October, depending on location.
  • Mode of reproduction is by seed.
  • The sharp pointed fruits or burs break into 5 sections at maturity. Each section contains 2 to 4 seeds.
  • Seeds may remain dormant in the soil for 4-5 years .
  • Spiny burs can attach to the fur of animal, bottom of shoes or to the tires of vehicles.
  • Puncturevine is found in pastures, roadsides, waste places, parks, agricultural areas.
  • The hard, spiny burs of puncturevine can damage wool and injure livestock and other animals. Puncturevine can be toxic to livestock, especially sheep.
  • Other common names: Goathead, bullhead, Mexican sandbur and Texas sanbur.

Control Methods:

Cultural/Prevention: Prevent the establishment of new infestations by minimizing disturbance, eliminating seed production and dispersal, and by maintaining vigorous perennial plant communities. Repeated cultivation just after germination is an effective control. If burrs are produced before cultivation, it is necessary to remove the plants and burrs and burn them.

Mechanical: Plants can be controlled by digging, hand-pulling or tilling infestations before flowering.

Chemical: Contact your local chemical provider or Extension office for specific herbicide recommendations.

Biological: None available for our climate.