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Clubroot resistance is an important part of clubroot management, and growers are advised to start using clubroot-resistant varieties as soon as clubroot is identified in their area. This will help keep clubroot at low levels in fields, and reduce the risk of selecting for resistant clubroot races…
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Clubroot-resistant canola is the best tool available to limit disease damage in fields infested with clubroot. However, an effective overall clubroot management strategy has to be top of mind in all years, not just canola years. As a soil borne disease, clubroot can spread no matter what crop is grown on a field. Any pass with the drill or cultivator,…
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Manitoba has had two canola fields confirmed this month to have clubroot symptoms on plants. Last year, clubroot was confirmed in two soil samples in the province, but plant symptoms were not observed. Clubroot is expected to spread across the Prairies eventually. The disease was first detected in Manitoba in vegetable crops in 1925. It is not a surprise to…
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Early detection makes clubroot easier to contain. By the time patches of clubroot infection are obvious in fields, clubroot spores may have been present for a while and may have already spread to neighbouring fields. Clubroot disease management plans will vary depending on the amount of disease and its severity, but growers in all regions should watch for the disease…
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Lots of sclerotinia stem rot. As harvest progresses, we’re hearing reports of higher levels of sclerotinia stem rot in some regions. Some fields that did not get a fungicide spray are at 40-50% infection. That works out to an estimated 20-25% yield loss, or 10-13 bu./ac. on a canola crop with 50 bu./ac. yield potential. Fungicide applications for sclerotinia stem…
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Sclerotinia stem rot infection is being found lower down the plant in many fields this year. Some fields are lodging because of sclerotinia infection. In some cases, sclerotinia infection is right near ground level, which is where blackleg is also found…
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Sclerotinia stem rot (above) and blackleg can both cause what looks like pre-mature ripening. Both diseases, when severe, can cut off nutrient flow up the stem, resulting in a whitened dead plant. Both can cause increased lodging. However, long-term management requires an accurate identification of which disease is the cause. Disease identification will make sure you make the correct seed…
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Many canola fields are within 5 to 10 days of swathing, which limits the choices for insecticides — based on pre-harvest intervals. Here are the pre-harvest intervals for insecticides registered for insect control in canola. Try the interactive PHI tool at www.spraytoswath.ca…
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Check those patches of pre-mature ripened canola before or during swathing. Try to identify what cause this pre-mature ripening. Use the Canola Diagnostic Tool at www.canoladiagnostictool.ca to help with the assessment. It could be blackleg, clubroot, sclerotinia, root rot or something else entirely. Growers can use this scouting information to plan rotations, choose varieties, and update fungicide decision-making for next…