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Douglas County Noxious Weed Control provides this information as a courtesy (disclaimer) to those who are interested in controlling noxious weeds. We recommend a combination of two methods below (an integrated approach) to effectively control an infestation. If you prefer to have a Commercial Company take care of your Control needs, you can visit our Contractor's Page or use any Contractor found in the Yellow Pages. Equipment may also be available at a local rental store.

Remember, no matter what method(s) is used, ALL AREAS of the property must be maintained. These areas include around fences, poles, mounds, holes, hillsides (no matter how steep), and any other areas that may require specialized control.

Chemical Application
The below information is derived from the Nebraska Cooperative Extension EC 06-130-D (HERBICIDE USE IN NEBRASKA). Please consult the individual pesticide label for proper application rates.

Always read and follow label directions and wear the proper Personal Protective Equipment


Application Timing 


Tordon 22K Fall - plant actively growing or Spring - early flower bud For non-crop areas and spot treatment in pasture and range. Tordon may remain in the soil for 3 or more years.

Tordon 22K
2,4-D LV Ester (4L) 

Fall or Spring - during flower bud 

For non-crop areas and spot treatment in pasture and range. 

Roundup Ultra 

Flower bud stage or in Fall when growing actively 

Idle ground or spot treatment in cropland before head or pod-fill of the crop. Avoid tillage for three days. 


Fall - actively growing or
Spring - early flower bud 

Idle ground or grassland. Avoid tillage for five days. Injury to forage grasses may occur.

Broadleaf crops may be injured for two years after treatment. 

Curtail or Stinger 

Rosette to pre-bud or Fall- actively growing 

Curtail - Use lower rate in wheat and barley, higher rate in fallow, pasture, or CRP. Stinger - used in Sugarbeet and Corn.

Ally + Surfactant 
Telar + Surfactant
Escort + Surfactant 

4 - 6" or rosette stage
Prebloom to bloom or
Fall - actively growing 

Escort or Telar for use in non-cropland only. Use Ally in wheat, barley or fallow to be planted to winter wheat. One application suppresses Canada Thistle.

* A property owner is not limited to these Herbicides only. Other Herbicides may be available, please consult the individual herbicide label for proper application directions. Herbicides can be found at coops, area nurseries, retail stores, farm stores, and other landscape centers. For more information on Herbicides and their uses please check with the Douglas County Extension Service.

Mechanical Control




Mowing (short-term method to
prevent seed spread)
Bloom Stage only Because of Canada Thistle's ability to regenerate by
small root parts, mowing should not be relied on as a control method. Tillage should not be an option.

Biological Controls
Biological Control (insects) have been used in Nebraska (especially in the Western half) since the late 1980's. These agents work slowly and results may not be seen for several years. They should be used as a tool and should be part of an integrated program and not relied on to completely control any noxious weed. They shall be as effective as the use of herbicides and shall be approved by the Douglas County Weed Control before being used.

Control Method Recommendation
Note: Improving the conditions and competition of desirable grasses and vegetation is the best defense against noxious weeds. Avoiding waste areas, overgrazing, disturbed ground and proper care of existing vegetation, will aid in keeping noxious weeds away.
KEY: Be PERSISTENT! A Perennial requires multiple years of control.




Chemical during early flower bud stage Mowing flower stage Chemical when actively growing

Since there is not a suitable (large) site of Canada Thistle for Biological Control Agents, Douglas County Weed Control will not accept these agents as a control method. In the case of a suitable infestation, we are open to investigating the release of these Agents.


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