Weather-based Assessment of Sclerotinia Stem Rot Risk

Researcher: Paul Bullock, University of Manitoba, Winnipeg MB

Project Code: 3.3.2

Final Report: July 2013

Summary: In western Canada, Sclerotinia stem rot continues to be a serious disease of canola.
Researchers at the University of Manitoba led a two-year study to assess the risk of sclerotinia stem rot disease on canola based on standard weather conditions and the canopy microclimate. The study showed that climate is a major contributor to disease development based on ascospore concentrations and disease incidence. Growers should be aware of the history of disease and inoculum levels in fields nearby. Fungicide
applications may be required on susceptible crops located adjacent to fields with disease history. Application timing of fungicides can be facilitated through weather predictions focusing on precipitation and relative humidity.

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