The latest Prairie wind trajectory cereal rust risk report is available for download now at the following link: June 14-20, 2023 report.
As of the period of June 14-20, 2023 the overall Prairie cereal rust risk assessment and need for in-crop scouting is as follows:
Pacific Northwest – There was moderate number of reverse wind trajectories that passed over the PNW region and into the Prairies and an increase versus June 7-13. Rainfall has recently occurred especially in central Alberta to the south Peace River region, southern Alberta. However, given limited stripe rust development in the PNW, as of June 20, 2023 the risk of stripe rust appearance from the PNW is low and scouting for this disease in the Prairie region is generally not urgent.
Texas-Oklahoma corridor – There was only one trajectory that pass over this source area and ended up in the Prairies and given that crops in the Texas to Oklahoma region are approaching maturity or are being harvested, this source region no longer represents a source of rust inoculum for the Prairie region and the PCDMN cereal risk report will focus on the PNW and Kansas/Nebraska regions. As of June 20, 2023 the risk of stem, leaf, stripe, and crown rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases in the Prairie region is not urgent.
Kansas-Nebraska corridor – Given a lower number of wind trajectories from this region, increasing rust incidence, especially stripe rust, albeit at low levels in this corridor, as of June 20, 2023 the risk of stem, leaf, stripe, and crown rust appearance from the Kansas-Nebraska corridor is generally low and scouting for these diseases in the Prairies is not urgent. However, recent reports of increasing levels of stripe rust in NW and west central Kansas, and the continued observation of stem rust in Kansas commercial fields may represent an emerging concern. These observations are a concern, however, the number of trajectories was reduced for June 14-20, while rainfall from June 12-18 was limited. Farmers and consultants in the central-eastern Prairies should consider keeping an eye out for stripe and stem rust development, especially in fields planted to susceptible varieties.
