DEFENDR® DISEASE RESISTANCE TRAITS BrettYoung is proud to support 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 prominent three disease complexes affecting canola: sclerotinia, clubroot and blackleg.
DefendR® Sclerotinia
DefendR Blackleg
For growers wanting to further reduce the impact of this
Blackleg is back in the spotlight as a disease that is
disease, BrettYoung’s DefendR Sclerotinia tolerance trait
evolving and making a strong resurgence in intensive
is built-in on the 6074 RR hybrid. Screening and testing
canola production areas. Most agree that managing
results for this variety demonstrates improved tolerance
this disease requires a combination of rotation, crop
superior to susceptible checks using industry-approved
management (including regular field scouting) and proper
testing protocol.
variety selection as important factors to reducing the impact of this disease.
The DefendR trait in 6074 RR provides sclerotinia DefendR is reserved for use only on BrettYoung
and a promise to canola growers that they are
varieties that deliver above industry-average levels of
purchasing a variety that has leading genetics
genetic resistance or tolerance to one or more of the
for disease management in a canola hybrid with
prominent canola diseases.
exceptional yield potential.
The DefendR Blackleg trait means the BrettYoung canola variety is rated as a strong R for Blackleg resistance. It also
• Reduce the impacts of infection and reduce yield loss
means that the variety incorporates multiple major genes
whenever disease pressure is present
to defend against multiple strains of Blackleg. DefendR
• Allow for greater flexibility in fungicide application
It is our nod to the strength of the breeding program with our primary canola partner, DL Seeds,
Resistance Trait
tolerance at levels that will:
Minimum Resistance Level
Varieties 6074 RR
Multi-genic (major gene) resistance to Blackleg, strong R for adult plant resistance rating
BY 6211TF BY 6204TF 6090 RR 4187 RR BY 5125 CL
Varieties include first-generation resistance genes but also contain resistance genes that may provide protection against newer pathotypes such as 3A, 2B, 3D, 8E, 5G, 5K, 3O and 5X.
BY 6207TF
compared to competitive R-rated varieties that have either
otherwise makes fungicide application timing difficult
zero or one major gene for Blackleg resistance.
• Reduce the impact of Sclerotinia in long-flowering crops
Growers looking to adopt a Blackleg major gene rotation
where the window of fungicide protection has lapsed
strategy can also look to the Blackleg DefendR system – BrettYoung shares the gene-specific information on all our DefendR products.
Sclerotinia Tolerance – internal stem infection
DefendR Clubroot Previously considered primarily a Canadian issue, Clubroot has now been identified in North Dakota. In 2013, a new Clubroot pathotype was identified in Alberta as the canola varieties, up to that time thought to be Clubroot resistant, were exhibiting high levels
Tolerant vs. Susceptible
of infection. Many new pathotypes have since been identified in several areas.
Sclerotinia Tolerance – 21 days after inoculation
The DefendR Clubroot trait from BrettYoung is resistance equivalent to Next-Generation resistance. Varieties include first-generation resistance genes but also contain resistance genes that may provide protection against newer pathotypes such as 3A, 2B, 3D, 8E, 5G, 5K, 3O and 5X. DefendR-rated Clubroot-resistant genetics are coupled to high-yielding, high-performance varieties.
Tolerant vs. Susceptible
6
7
CANOLA
Improved Tolerance (IT) to Sclerotinia Stem Rot
Blackleg varieties achieve a broader level of resistance
timing when flowering is uneven and staggered, which
