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CCC agronomy director Clint Jurke is looking for farmers who made the decision to spray or not spray fungicide for sclerotinia based on what a sclerotinia stem rot prediction tool – sclerotinia checklist, spore testing or weather station predictions – told them…
Sclerotinia stem rot
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The window for fungicide application closes after 50 per cent flower – which is when the field is at its most yellow. Once this “full bloom” starts to wane, spraying must stop… -
In general, late applications are not as effective as applications at 20 per cent flower because early infection tends to cause the most yield loss. But fungicide applied late in the window can provide valuable protection from sclerotinia stem rot if flowering is extended or if conditions become more conducive to disease…
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What is 20 per cent flower? When to spray an uneven crop? What is the right amount of moisture for disease? And more… -
These three questions will help canola farmers and agronomists assess the sclerotinia stem rot risk in their areas…
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The decision to apply a fungicide to prevent sclerotinia stem rot may be generalized by answering these four questions: (1) Have environmental conditions prior to flowering been wet enough for apothecia development and survival? (2) Is the canola crop canopy dense and is yield potential high? (3) Does the weather forecast predict precipitation and/or humidity during the flowering period? (4)… -
Once petals drop and start to decay, infection proceeds very quickly with lesions being visible in as little as 24 hours… -
Timing and coverage are keys. For most fungicides, the recommended window for application falls between 20 and 50 per cent bloom, with optimum timing typically around 30 per cent bloom… -
Hot, dry weather reduces infection rates and the progression of sclerotinia within the plant. The disease risk is limited when current conditions are dry, max daily temps are 30°C or……
