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If conditions were dry, then turned wet, the sclerotinia risk depends on when this transition occurred. Early dry weather doesn’t matter as much as long as you have moisture within the canopy leading up to and during the flowering period…
Sclerotinia stem rot
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As a rough estimate, the 20% flower or "bloom" stage is when the main stem has around 15 “flowers”. Canola can reach 20% bloom in 4-5 days after first flower… -
Prevalence of sclerotinia stem rot has a direct correlation to above-average moisture. If a field has regular rains or high humidity or both from two weeks before flowering and through flowering, then infection will likely occur. If growers decide to spray, the window for most products is 20-50% flower. Earlier is usually better as early infection on the main stem… -
Results from the disease survey show increases in sclerotinia stem rot incidence. Blackleg incidence is down from 2015 in Manitoba and Saskatchewan and up in Alberta… -
Learn to tell the difference between common lesion-causing diseases — blackleg, sclerotinia stem rot and alternaria black spot… -
Heavy rains can increase the sclerotinia stem rot risk but they also make fields too wet for ground sprayers. This can delay timely applications, especially because demand for aerial applicators can make for long wait times. Here are scenarios that may help you work through this situation… -
Factors that increase the sclerotinia risk, factors that reduce the risk, and situations where a second application may be warranted…
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Here are a few questions we often get on sclerotinia stem rot management. Answers and links may help with your management decisions…
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If a field has regular rains or high humidity or both from two weeks before flowering and through flowering, then infection will likely occur…
