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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…
Diseases
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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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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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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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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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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… -
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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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…
