Clubroot Distribution Map (2009-2014)


Map shows positive clubroot findings by Rural Municipality, discovered through laboratory testing for presence of clubroot spores in soil and/or positive confirmation of clubroot symptomatic plants.  Testing was done from 2009-2014 and is still considered limited.  Positive findings have been at low spore concentrations and sporadic throughout the province. As more fields are sampled, the map will be updated.

As less than 5% of farms in Manitoba have been tested, it is recommended that all fields be tested to determine if clubroot spores are present, regardless of RM classification. To date, clubroot has been confirmed in 48 Manitoba fields.
Clubroot is a soil-borne pest that can move from field to field on both agricultural and non-agricultural equipment. Specific biosecurity activities to minimize the spread of clubroot will differ by the known levels of clubroot DNA found within the field.  MAFRD has a series of suggestions for all industries operating on agricultural land to minimize the potential of spread on the Crop Biosecurity page.
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Over the Course of Time: Manitoba Canola Diseases 2009-2014

Canola is one of the most economically important crops produced in Manitoba and yield robbers such as canola diseases need to be identified in order to apply best management practices. For many years, sclerotinia has been the most significant canola disease in Manitoba. However, in recent years the prevalence (% of fields infested) and incidence (% plants infected per field) of blackleg have been increasing.

Disease incidence and severity will change from year to year based on use of genetic resistance in varieties, environmental conditions, and agronomic practices such as crop rotation and fungicide use. Annual surveys of commercial canola crops provide valuable information on the distribution of disease, impact of farming practices on severity and incidence, help agronomists and farmer prioritize where future resources need to be directed, and can provide an early-warning system that provides information on the occurrence of disease/pesticide breakdown.

For more information on the annual Manitoba canola disease survey including methods, results from 2009 to 2014, and further discussion, please view the attached poster which was presented at the 2014 Manitoba Agronomists Conference:

Over the Course of Time Manitoba Canola Diseases 2009_2014 (Kubinec et al., 2014)

For more information on canola diseases in Manitoba, and information on various types of control methods, please visit MAFRD’s website at
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WANTED: Canola Fields to Test for low levels of Clubroot

Pest Surveillance Initiative (PSI) lab is a project of the Manitoba Canola Growers Association (MCGA) and Manitoba, Agriculture, Food and Rural Development (MAFRD).  The PSI lab provides Manitoba growers with the ability to test soil for low levels of clubroot DNA.  Although more than 250 township-range combinations have been collected through the Manitoba Canola Disease Survey (2009-2014), an additional 650 samples are needed  provide coverage of all the agricultural areas of Manitoba.  With funding from the Growing Forward 2, Growing Actions program, PSI is working to complete a map to outline the current incidence of clubroot within Manitoba on a township-range basis.

 PSI is looking for canola fields from all township-ranges in agro-Manitoba to be sampled for low level presence of clubroot DNA.  If you are interested in having your canola fields sampled for this project, please contact Mavis McPhail at [email protected].  When sending your email please provide the legal land descriptions that had canola in 2014, so we can cross-reference to the township-ranges already sampled.  Only fields in township-range combinations not previously sampled will be sampled through this project.

 PSI will send a trained pathologist to sample selected fields free of charge and have that sample analyzed for presence and concentration of clubroot spores in the soil.  Growers will receive the results from their fields directly from PSI. All individual grower information and specific section coordinates will remain confidential, but the township-range level will be used to generate a map showing the presence/absence of clubroot.  This map will be updated regularly as additional samples are analyzed.

For more information on clubroot in Manitoba:

Plant Surveillance Initiative Lab:

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Clubroot Distribution in Manitoba

MAFRD has released a map that shows positive clubroot (CR) findings by Rural Municipalities (RM) discovered through soil and/or plant tissue analysis for presence of CR DNA or symptomatic plants from sampling done between 2009-2013.  It is available at

In Manitoba, CR positive fields are defined as where DNA of the CR pathogen, Plasmodiophora brassicae, has been confirmed in soil or fields where canola plants with clubroot symptoms have been found.

Testing to date has been limited as less than 2% of the farms in Manitoba have been sampled; positive findings have been sporadic and at low concentrations throughout the province. As more fields are sampled, the map will be updated.

Cleaning of both agricultural and non-agricultural equipment is recommended, removing visible soil and plant debris off equipment using shovel, scraper, and/or compressed air. Once an RM is determined to be positive, then cleaning of equipment as previously recommended is necessary and should be followed by a water wash and a disinfectant (eg. 2% bleach).

For more information, contact the MAFRD Crops Knowledge Centre.

Submitted by:  Anastasia Kubinec, Provincial Oilseed Crops Specialist, MAFRD

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