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…
Diseases
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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)…
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Canola cultivars are available with improved tolerance to sclerotinia stem rot. This reduced severity of sclerotinia stem rot is effective but may not match the same level of control as a fungicide application. Therefore under high risk of disease development applying a fungicide to these cultivars may still be necessary…