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Affected Regions

Clubroot is a disease that affects crucifers worldwide. In the United States, there have been a number of reports of clubroot on Brassica crops from several states, varying in degree of severity and incidence.

In Canada, clubroot is primarily established in the vegetable growing regions of British Columbia, Quebec, Ontario, and the Atlantic provinces. It has also been detected in vegetable crops in both Alberta and Manitoba. Identification of clubroot in commercial canola fields in western Canada is a relatively recent occurrence.


In 2003, clubroot was identified in commercial canola near Edmonton, AB. This was the first report of clubroot in a commercial canola field in Canada. Since 2003, clubroot has been found in an increasing number of canola crops in this region. According to information provided by the Alberta Clubroot Management Committee, clubroot has been detected in over 1,000 fields, with incidence levels ranging from below 30% (low) to above 70% (high). The disease distribution in infested fields has generally been patchy but in the 10 to 15% of canola crops with high levels of clubroot infestation, the disease has occurred fairly evenly throughout the field. Alberta named the clubroot pathogen as a declared pest in the Alberta Pests Act in 2007 and released the Alberta Clubroot Management Plan in 2008 (revised in 2010 and 2014). 

U of A clubroot map


























Figure 1. Alberta Clubroot Map: Cumulative clubroot infestations as of November 2018. Map courtesy of University of Alberta and Alberta Agriculture and Forestry.



Phone Number


Athabasca (780) 675-2273 www.athabascacounty.com
Barrhead (780) 674-3331 www.countybarrhead.ab.ca
Beaver (780) 663-3730 www.beaver.ab.ca
Camrose (780) 672-4765 www.county.camrose.ab.ca
Cypress (403) 526-2888 www.cypress.ab.ca
Flagstaff (780) 384-4104 www.flagstaff.ab.ca
Lacombe (403)-782-6601 www.lacombecounty.com/
Lac Ste. Anne (780) 785-3411 www.lsac.ca
Lamont (780) 895-2233 www.lamontcounty.ca
Leduc (780) 955-6415 www.leduc-county.com
Lethbridge (403) 328-5602 www.lethcounty.ca
Minburn (780) 632-2082 www.minburncounty.ab.ca
Newell (403)362-4343 www.countyofnewell.ab.ca
Parkland (780) 968-8467 www.parklandcounty.com
Ponoka (403) 783-3333 www.ponokacounty.com
Red Deer (403) 350-2150 www.rdcounty.ca
Special Area No. 3 (403) 854-5600 specialareas.ab.ca
Stettler (403) 742-4441 www.stettlercounty.ca
Strathcona (780) 417-7130 www.strathcona.ca
Sturgeon (780) 417-7130 www.sturgeoncounty.ab.ca
Thorhild (780) 398-3741 www.thorhildcounty.com
Vermilion River (780) 846-2244 www.vermilion-river.com
Westlock (780) 349-3346 www.westlockcounty.com
Wetaskiwin (780) 352-3321 www.county.wetaskiwin.ab.ca
Yellowhead (780)-723-4800 www.yellowheadcounty.ab.ca
City of Edmonton   www.edmonton.ca



Pest Surveillance Initiative - Interactive map

According to information provided by Manitoba Agriculture, Food and Rural Initiatives, the presence of the pathogen (Plasmodiophora brassicae) responsible for clubroot has been reported in Manitoba on symptomatic cruciferous vegetables. Reports have been very sparse, with the first note dating back to an unconfirmed report on rutabaga in 1925. In the 1980’s, clubroot was found on market garden cruciferous vegetables. More recently, clubroot was found in 2005 on canola. This occurrence was of very low incidence, and the symptoms were of very low severity. In 2011 the clubroot pathogen was again detected in Manitoba from soil samples submitted to the annual canola disease survey in two fields, but concentrations were too low to produce symptoms on brassica test plants in a bioassay. In 2012, the disease survey again found six more positive fields from soil tests, but this year two fields also had clubroot resting spore concentrations high enough to produce galls in the bioassay. Manitoba has not declared clubroot a pest under the Manitoba Pest Act.

Manitoba clubroot map


According the Saskatchewan Ministry of Agriculture, in 2008, the clubroot pathogen's DNA was first detected in a soil sample collected from one of 30 randomly-selected fields in the clubroot survey. While the pathogen appeared to be present, the clubroot disease itself was absent, since no infected canola plants were identified at that time. But a subsequent bioassay did confirm that the resting spore concentration was sufficient enough to produce clubroot symptoms in plants. In subsequent clubroot surveys in 2009 and 2010, no further evidence of this disease was found.

In 2011, clubroot was identified in canola plants growing in two fields in the rural municipalities of St. Louis and Aberdeen in north central Saskatchewan. Soil tests around these sited confirmed the presence of the clubroot pathogen in the soil. These fields were associated with canola research trials. One more clubroot positive field was identified from the 2012 canola disease survey in the rural municipality of Biggar. This field was randomly selected and a soil sample tested positive for the presence of the clubroot pathogen. A subsequent bioassay further confirmed that resting spore concentrations were high enough to produce symptoms in brassica plants.

In 2017, clubroot symptoms were identified and clubroot was confirmed in crop districts 9A and 9B with fewer than 10 canola fields identified to have clubroot in each crop district.

In order to gain a better understanding of the distribution and severity of clubroot in Saskatchewan, the Ministry of Agriculture and SaskCanola, with support from SARM are conducting an extensive clubroot survey in 2018. This survey covered 1800 townships and approximately 1500 fields. The survey area will cover the northern agricultural regions and a large area along the east side of the province. For more information about this survey, please contact the Agriculture Knowledge Centre at 1-866-457-2377

The Saskatchewan clubroot distribution map illustrates the distribution of clubroot and the clubroot pathogen in the province and can be used as an estimation of regional clubroot risk. The map is cumulative and includes all findings of clubroot and detections of the clubroot pathogen from 2008 to 2018. All detections of clubroot and the clubroot pathogen are included in this map, as the clubroot pathogen is long lived and cannot be eradicated. As a result, areas where clubroot and/or the clubroot pathogen were first identified in Saskatchewan are considered to still have an increased risk and are therefore included in this map illustrating cumulative findings. In addition to illustrating the distribution of fields with visible clubroot symptoms, the map provides information on the number of fields in each rural municipality (RM) confirmed to have clubroot visible symptoms.


Saskatchewan clubroot distribution map




















The information in this map is organized into four main categories that are illustrated by four different colours.

  1. Blue: In these RMs, the clubroot pathogen was detected at low levels in soil samples from at least one field in the RM. When only the clubroot pathogen is detected it means that the pathogen is present at levels lower than those required to cause disease symptoms under field conditions. When this occurs, producers are encouraged to implement proactive management strategies to keep the pathogen levels low to prevent symptom development and potential yield losses
  2. Yellow: Visible symptoms of clubroot were identified in one to nine fields in the RM
  3. Orange: Visible symptoms of clubroot were identified in 10 or more fields in the RM.
  4. Grey: The grey area on the map outlines the area of the province that was included in the 2018 extensive clubroot survey. The grey colour indicates that the RM was surveyed but neither clubroot visible symptoms nor the clubroot pathogen were detected

(Government of Saskatchewan, 2019)

Further reading on the clubroot in Saskatchewan at:

Understanding the Saskatchewan clubroot distribution map

Comparing prairie provincial clubroot distribution maps

Learnings from the 2018 Saskatchewan clubroot survey