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DefendR Genetic Traits

BrettYoung is proud to introduce the DefendR trait platform as part of an active disease management strategy. The DefendR designation is used to signal exceptional genetic resistance or tolerance to the big 3 disease complexes affecting canola: Sclerotinia, Clubroot and Blackleg.

DefendR is reserved for use only on BrettYoung varieties that deliver significantly above industry-average levels of genetic resistance or tolerance to one or more of the prominent canola diseases. It is our nod to the strength of the breeding program with our primary canola partner, DL Seeds, and a promise to canola growers they are purchasing a variety that has leading genetics for disease management coupled with a canola hybrid with exceptional yield potential.

Disease Resistance Trait Minimum Resistance Level Varieties
Improved Tolerance (IT) to Sclerotinia Stem Rot 6074 RR
6076 CR
Multi-genic (major gene) resistance to Blackleg, strong R rating BY 6204TF
6090 RR
4187 RR
6076 CR
5545 CL
Resistant to Clubroot pathotypes
2, 3, 5, 6, 8, 3H, 3A & 5X.
6076 CR


DefendR Sclerotinia


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For growers looking to reduce the impact of this disease, BrettYoung’s DefendR Sclerotinia tolerance trait is included in both the 6074 RR and 6076 CR hybrids. Screening and testing results 
in both these varieties have shown improved tolerance superior to susceptible checks in reaction to inoculation with Sclerotinia sclerotorium using industry-approved standardized testing protocol.

The DefendR trait in 6074 RR and 6076 CR provides Sclerotinia tolerance at levels that will

  • Reduce the impacts of infection and reduce yield loss wherever disease pressure is present.
  • Allow for greater flexibility in fungicide application timing when flowering is uneven and staggered, which otherwise makes fungicide application timing difficult.
  • Reduce the impact of Sclerotinia in long-flowering crops where the window of fungicide protection has lapsed.

DefendR Blackleg


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 Blackleg is back in the spotlight as a disease that is evolving and making a strong resurgence in intensive canola production areas. Most agree that managing this disease requires a combination of rotation, crop management (including regular field scouting) and proper variety selection as important factors to reducing the impact of this disease.

The DefendR Blackleg trait means the BrettYoung canola variety is rated as a strong R for Blackleg resistance. It also means that the variety incorporates multiple major genes to defend against multiple strains of Blackleg. DefendR Blackleg varieties achieve a broader level of resistance compared to competitive R-rated varieties that have either no, or only one, major gene for Blackleg resistance.


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DefendR Clubroot

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Previously considered primarily a Central Alberta issue, Clubroot has now been identified in all three Prairie provinces. In 2013, a new Clubroot pathotype was identified in Alberta as the canola varieties up to that time thought to be Clubroot resistant were showing high levels of infection. New pathotypes have since been identified in several areas.

The DefendR Clubroot trait is resistant to pathotypes 2, 3, 5, 6, 8, 3H, 3A and 5X. BrettYoung will continue to commercialize DefendR-rated Clubroot resistant genetics couplied to high yielding, high performance varieties.