*Updated January 10, 2019. Email firstname.lastname@example.org if you have varieties to add.
Here are the clubroot-resistant (CR) canola varieties currently available in Western Canada. Varieties with a ** denotation contain a new clubroot resistance trait.
4187 RR (previously SY 4187)
DKTF 94 CR
PV 581 GC
PV 591 GCS
PV 585 GC**
Growers using clubroot-resistant varieties in clubroot-infested fields may experience some infected plants, which can be attributed to susceptible volunteers and off-types. Volunteer canola seed can germinate many years after it was last grown, and if this comes from a susceptible canola crop, then the volunteers will be susceptible. Off-types are a normal part of hybrid canola production – no canola hybrid is 100% pure, so there may be a small proportion (1 to 4%) of the seed that is susceptible.
When scouting, if more than 10% of seeded plants (do not count volunteers) are infected, that may indicate that the clubroot resistance is no longer functional against the pathogen population in the field. These infected plants may be restricted to a small patch which indicates a recent pathogen change.