Prairie wheat growers are seeing generally good progress this season, with winter wheat advancing through the flag leaf to booting stages and spring wheat ranging from seedling to early tillering. However, recent weather patterns are prompting cautious optimism mixed with a note of vigilance, according to the latest 2025 Cereal Rust Risk Report.
Temperatures across the Prairies have trended above normal since April 1, with recent daytime highs ranging from 8.5°C to 15.7°C—conditions that are typically less conducive to rust development. Still, stripe rust, which prefers cooler temperatures than other rust types, remains a potential concern.
Rainfall has been below normal overall, but recent precipitation in some areas may have washed stripe rust spores into crops, especially winter wheat, and created canopy conditions favourable for infection.
Meanwhile, stripe rust development in the Pacific Northwest (PNW)—a common source of airborne spores—is currently lower than in 2024. Between May 27 and June 2, wind trajectories bringing spores from the PNW into the Prairies were limited, meaning the overall threat remains low as of June 5.
However, 20 locations—mainly in Alberta and some in Saskatchewan—showed elevated trajectory activity. Growers in these areas, particularly those growing susceptible varieties, are advised to remain alert and check for symptoms during routine field visits.
Scouting is not considered urgent at this time, but early detection could help manage any localized outbreaks should conditions shift.
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