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Clear patches of canola plants that are ripening prematurely could be diseased. These are obvious places to start a pre-harvest disease survey…
Disease ID tips for pre-harvest scouting
August 12, 2020
Diseases
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Clubroot: Scouting for pathotype shift
August 12, 2020
Researchers have identified at least 36 clubroot pathotypes in Western Canada, and roughly half are not controlled by the common clubroot resistance source – often referred to as first generation or "gen 1" resistance. That is why hybrids with clubroot resistance (CR) can still have clubroot galls…
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Quiz – Clubroot/not clubroot
July 29, 2020
Through the pod filling time between flowering and harvest, growers and agronomists will want to take time for a more intense session of clubroot scouting. But what are you looking for? This quiz will help train your eye…
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Scouting for clubroot: How and why now?
July 29, 2020
Vigilantly scout all canola fields for symptoms, even if growing a clubroot resistant (CR) variety. Clubroot galls can start to form about three weeks after emergence, but typically it takes about six to eight weeks for visible galls to form in fields. So galls – if present – will be visible by this stage of the season…
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Will hot, dry weather stop sclerotinia stem rot?
July 29, 2020
Not really. If infection got started, then this fungus is in the plant. When conditions are ideal (relative humidity over 80 per cent and temperatures of 20°C to 25°C) then pathogen grows aggressively eating up more tissue. When conditions are not ideal, the disease slows…waiting, patiently…
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Scouting for clubroot: Why now?
July 22, 2020
One reason... If clubroot is found, you have time to take some focused action on these areas. If the patch is small enough, pull up all the plants that have galls, then cut off the galls and dispose of them…
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Did you use a sclerotinia prediction tool?
July 22, 2020
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…
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Sclerotinia window and pre-harvest interval
July 22, 2020
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…
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Sclerotinia: Does fungicide at 50% flower make sense?
July 15, 2020
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…