Home / Canola Watch / Sclerotinia stem rot / Page 10
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When it comes to the sclerotinia stem rot risk, moisture has a much larger influence than temperatures. Infection can be high in hot weather as long as the moisture is there. Moisture can come from rain, relative humidity in the high 80s, or morning dew…
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Split applications, which are approved for some fungicides, may be worthwhile in some cases. For instance, if the sclerotinia stem rot risk is questionable at early bloom, growers could use a split rate and then wait to see if the second application is needed. Another benefit to the split is if the crop is uneven and the flowering period could…
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Moisture is the key factor in sclerotinia stem rot risk. Good soil moisture and a few rains in the period starting two weeks before flowering and carrying through to infection after flowering will greatly increase the sclerotinia risk. Fungicide sprays, if applied, need to go on canola at between 20% and 50% flower. See this week's photo quiz for a…
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Hail that hits canola before flowering or at early flowering may have a minimal effect on yield. Plants will flower longer and compensate…
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Earliest canola is starting to flower this week, which means the sclerotinia spray decision looms. Spray timing, if a grower decides to go for it, should be within the window from 20% to 50% bloom. Canola can reach 20% flower in 4-5 days after first flower. The article also includes information on adding boron to a fungicide tank mix…
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Growers seeing stem lesions or pre-mature ripening should take a closer to identify the cause. There is a good chance it’s sclerotinia. But it could be blackleg. It’s important to identify the cause because it will help in management for next year…
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The sclerotinia spray decision is more complicated for growers with canola stands that are thin, late or at multiple stages. Multi-stage and thin crops that have good yield potential and are fairly well advanced may benefit from a split fungicide application…
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Regrowth after hail may extend the flowering period, which also increases the sclerotinia stem rot risk. If yield potential is still high and if conditions favorable to sclerotinia stem rot persist, then a fungicide spray may pay off…
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Fungicide to protect the crop from sclerotinia stem rot infection must be applied to petals before infected petals start to drop into the canopy. Petal drop starts after 30% flower,……