Clubroot is a soil-borne disease of canola and other cruciferous plants of the Brassicaceae family which is caused by a pathogen called Plasmodiophora brassicae. Clubroot is spread when infested soil is transported by vehicles and farm machinery or though wind and water erosion. Roots of infected plants have a club-like appearance (Fig. 1). Above-ground symptoms vary depending on the growth stage at time of infection. Common symptoms include wilting, stunting, yellowing, and premature ripening. Above-ground symptoms are similar to common canola disorders thus it is important to carefully dig up suspect plants and inspect the roots.
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Figure 1. Characteristic clubroot galls on an infested canola plant. Photo: (LL, ND, CC BY-SA 2.0) |
- Access the current
clubroot map here to
learn more about where this disease occurs within Alberta.
- Refer to Alberta Agriculture
and Forestry's website for
more information on clubroot.
- Refer
to Clubroot Disease |
Canola Encyclopedia (canolacouncil.org) for more
information.
- Refer to Preventing Clubroot: Agricultural
Sanitization for more information on
preventing clubroot.
Back in 2004, the Integrated Pest Management Program (IPM) implemented biosanitation protocols including use of tyvek booties and sterilization of all field equipment. From 2017-2018, field sanitation involved the use of Virkon and bleach and, since 2019, involved bleach only. As of May 2023, our biosecurity protocol includes:
- Adhering to a strict field research sanitation protocol.
- Identifying ourselves by operating
marked Government of Canada vehicles when
visiting fields.
- Reducing or cancelling field
work activities on rainy days to avoid tracking mud.
- Washing AAFC vehicles at commercial car washes BEFORE and AFTER conducting field work (Fig. 2).
- Sterilizing and washing vehicle floor mats with bleach each day (Fig. 3).
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Figure 2. Washing AAFC vehicle at the commercial to remove soil after a long day of fieldwork. Photo: Maddy Jones-AAFC Beaverlodge. |
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Figure 3. Floor mats are hung and sterilized with bleach while at the commercial car wash. Photo: Maddy Jones-AAFC Beaverlodge. |
- Wearing impermeable shoes while
operating and exiting vehicle. These shoes are sterilized each day.
- Sterilizing impermeable boots
using bleach both AT and BETWEEN each field (Fig. 4).
- Wearing disposable booties are over sterilized impermeable boots prior to entering field or pull-in (Fig. 5).
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| Figure 4. Impermeable boots are placed into bins containing a bleach solution while traveling between field sites. Photo: Maddy Jones AAFC-Beaverlodge. |
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Figure 5. Disposable booties are donned over sterilized impermeable boots prior to field entry at each site. Photo: Maddy Jones AAFC-Beaverlodge. |
- Parking AAFC vehicles on the side of the road - we NEVER drive into a field!
- Using sodium hypochlorite or bleach (2%) to sterilize vehicle tires, wheels, and wheel-wells both AT and BETWEEN each field (Fig. 6).
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Figure 6. Wheel-wells and tires are sterilized upon arrival to each field site using a bleach solution. Photo: Maddy Jones AAFC-Beaverlodge. |
- Soaking all field equipment
that contacts soil (e.g., spades, trowels, soil core samplers) in bleach
after use in each field.
- Bagging and sterilizing all booties using an autoclave (employs high temperature and pressure).
- Carrying multiples of small field equipment to allow for soaking in bleach and/or sterilization using an autoclave.
- Maintaining a log of all visits and all field sanitation protocols implemented.
We thank growers for their continued support of field research in commercial fields by granting permission for our staff to access land. We want the agricultural industry to be aware and confident that are staff are doing their utmost to ensure every field remains protected.
Post prepared by Madysen Jones
