New Canola Variety Shows Some Resistance to 5X Clubroot Pathotype

Canterra Seeds has announced it is going to be releasing the first canola hybrid with any level of resistance to the new 5X clubroot pathotype for planting in 2015.

The new race of clubroot disease was discovered in a field north of Edmonton in 2013. Testing by Dr. Stephen Strelkov of the University of Alberta showed the new CS2000 hybrid from Canterra has resistance to existing clubroot pathotypes 2,3,5,6 and 8 and intermediate reaction to the 5X pathotype.

The company expects the variety, which was bred by DL Seeds, will receive approval for registration within weeks, which would make it the first registered hybrid to show tolerance to the new clubroot pathotype. Growers will have access to seed for planting this spring, but supplies will be limited.

“CS2000 is a huge step forward for growers battling clubroot,” said David Hansen, President and CEO of Canterra Seeds, in a news release issued on Wednesday. “And just as importantly, it also brings excellent yield, standability and agronomic characteristics. It’s a win-win variety for us and for our retailer partners who strive to bring the very best genetics to their farmer customers.”

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ward toma

Edmonton, Alberta – February 2, 2015 Recently, it was announced that a new canola variety had intermediate resistance to the newly identified clubroot pathotype 5x due to its intermediate reaction when exposed to the pathotype. The Alberta Canola Producers Commission (ACPC) and Alberta canola growers need to be provided with more details and learn more about these claims of “revolutionary” resistance to new virulent strains of clubroot by seed companies.

“The confusion arises from the fact that “intermediate” reaction or resistance is a new term for growers,” says Ward Toma, General Manager of the ACPC. “While there is an agreed definition of what an intermediate reaction to the pathogen is, there is no general agreement about what an intermediate level of resistance means for yield loss or managing the buildup of resting spores in the soil.” This situation is unlike currently accepted blackleg ratings, which clearly define “moderate resistance” and “moderate susceptibility”.

The ACPC urges the Pathology Sub-Committee of the Western Canadian Canola/Rapeseed Recommending Committee, (the organization that handles the protocols around disease rating for canola) to address this issue. Providing clarity will enable growers to understand exactly what is being introduced into the market.

“The fact that some varieties weren’t completely susceptible to the 5x pathogen is encouraging news,” says Toma. “Up to this point, everything that was exposed to it died so this result offers evidence that strong resistance may yet be found. Regardless of variety, best management practices for clubroot continue to be the application of sound rotation and sanitation in combination with genetic resistance.”

The Alberta Canola Producers Commission (ACPC) was the province’s first refundable check-off producer organization. The mandate of the ACPC is to increase the long term profitability of Alberta canola growers through research, consumer and producer education programs, and policy development.

For more information contact:
Ward Toma
General Manager
Alberta Canola Producers Commission
1-800-551-6652
[email protected]

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