Disease
The following articles are categorized as 'Disease'
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Disease update
So far relatively low levels of sclerotinia infection are being reported in most areas. Blackleg is appearing in eastern Manitoba and southern Alberta.
Scouting and identifying disease(s) present can be a valuable tool for assessing this year’s production practices and preparing for next years. Here’s what to look for
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Disease Update
Relatively low levels of sclerotinia infection can be found in most areas except in heavy and late maturing crops in northwest Saskatchewan where disease pressure is high due to frequent rains through the flowering period. Higher amounts of alternaria are occurring in B. juncea and B. rapa in western Saskatchewan and in B. napus fields in eastern Manitoba. In eastern Manitoba, more blackleg is appearing.
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How to scout for clubroot
Clubroot infestation has been spotted in a field near Vermilion, Alberta. This suggests a continued eastern movement of the disease. Growers in Alberta or western Saskatchewan are encouraged to examine strange disease patterns to see if clubroot has arrived on their farms.
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Is that sclerotinia or blackleg?
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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Pay attention to pre-harvest intervals
The pre-harvest interval is the number of days that must pass between the last application of a pesticide and cutting of the crop. Cutting is either swathing or straight cutting.
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Sunscald appearing
Sunscald occurs when plants are ripening during periods of heat or other stresses. The main symptom is purpling on the stems and pods. The purpling is an abiotic stress response and does not cause yield loss.
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Blackleg appearing
Growers are encouraged to scout canola and assess the level of blackleg damage before they harvest the crop.
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Hail at flowering. Now what?
Yield loss from hail will depend on crop stage and severity of the damage. In addition to physical injury, hail damage allows a point of entry for diseases such as alternaria black spot and blackleg to infect canola plants.
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Sclerotinia in an uneven crop: Consider a split application
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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Sclerotinia spraying: Ground vs. aerial
All sclerotinia control products are registered for both ground and aerial application. Both methods have their positive and negative aspects. If a fungicide is needed, getting it applied at the right stage will be the most important consideration.
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If you have general questions about the Canola Watch Email Newsletter, direct them to Jay Whetter.
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