In the most recent Insect & Disease Update (http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-update-2015-06-02.html), Holly Derksen, MAFRD Pathologist, included a Rust Update where “stripe rust has been reported in North Dakota all the way up to the Canadian border” (source: Cereal Rust Bulletins, USDA).
What are the stripe rust resistance ratings for wheat varieties grown in Manitoba? The most current stripe rust disease resistance ratings for spring wheat varieties can be found in Seed Manitoba 2015 (http://www.seedmb.ca/). There is variability of resistance levels in many of the CWRS varieties, but many of the current varieties do have improved levels of resistance.
However, resistance ratings for winter wheat varieties were not included in Seed Manitoba 2015, but will be in future issues. Therefore, find below a table showing the stripe rust ratings for winter wheat varieties. Disease data was collected during (and in some cases after) the varieties went through the variety registration process.
Resistance level disease ratings: R = Resistant; MR = Moderately Resistant; I = Intermediate; MS = Moderately Susceptible; S = Susceptible; ‘-‘ = not available.
Producers are encouraged to continue scouting their wheat fields! To learn about stripe rust, its disease cycle and symptoms, and control measures, visit MAFRD’s website at http://www.gov.mb.ca/agriculture/crops/plant-diseases/stripe-rust-puccina-pathway.html.
Since winter wheat is advancing quickly, it is hopeful winter wheat will not be impacted if stripe rust does arrive here in Manitoba. However, as mentioned earlier producers should continue scouting their spring and winter wheat fields.
Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist, MAFRD