Stripe rust has been confirmed in Ontario winter wheat fields, including Oxford and Huron counties. Growers are urged to scout frequently because the disease can move rapidly and turn healthy fields yellow and dead within about a week. Yield loss can be substantial if fungicide timing is missed. Management depends on crop stage and how close fields are to a T3 fungicide application window used for fusarium control. In areas near T3 timing, growers may wait unless stripe rust pressure is severe. Farther from T3 timing, especially when the flag leaf is emerging, immediate action may be needed. All major fungicides can control stripe rust, but delays of only several days can reduce yield.
"They call it yellow death in Europe, because within a week you can go from this gorgeous field to one that looks totally yellow and is basically dead. The yield loss is incredible."
"Based on the best data that we know from last year, you lose a bushel per acre per day from the time you see the first few lesions of stripe rust till the time that you spray that fungicide."
"Management decisions hinge largely on crop staging and proximity to a T3 fungicide application timing. In areas such as Kent and Essex counties, where heads are beginning to emerge and growers are close to a T3 timing for fusarium control, Johnson says it may make sense to wait unless stripe rust pressure is already severe."
"Johnson stresses that all major fungicides provide good control, but timing is critical. Delaying an application by even several days can result in substantial yield loss if the disease is active."
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