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This map shows accummulated moisture across the Prairies for the 30 days from April 6 to May 5. Topsoil moisture is generally good across the Prairies. Moist soil is more likely to get picked up by seeding and spraying equipment and carried field to field, spreading clubroot as well as other diseases and weed seeds and whatever else might be…
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Can you go four for four? Here are the questions: 1. One gram of soil, less a sugar cube’s worth, from a heavily clubroot-infested field could have how many clubroot spores? 2. Considering the answer to question 1, how many canola plants could be infected with clubroot if that one gram of heavily infested soil was sprinkled over an entire…
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Research shows that a pre-seed burnoff will result in higher yields versus no pre-seed burnoff. Walk fields to see what weeds are present and how fast they’re advancing. Seeding can begin fairly soon after a burnoff…
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Moist seed conditions mean more soil clinging to drills and tractor and sprayer wheels. This increases the risk of moving clubroot as well as weed seeds and insect pupae around the farm. With the discovery of a potential new clubroot pathotype, growers will want to take time to sanitize equipment between fields…
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Canola profits tend to benefit most from a nutrition plan that includes nitrogen, sulphur and some seed-placed phosphate. But what about potassium? Or micros? The Canola Council of Canada’s Ultimate Canola Challenge (UCC) will continue for 2014, with 15 sites across the Prairies. UCC will include many of the same comparisons as 2013, looking at various micronutrient treatments to see…
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New data from the Alberta clubroot disease survey indicates some forms of clubroot resistance are no longer functioning well against a possible new clubroot pathotype in the Edmonton region. Dr. Stephen Strelkov at the University of Alberta has investigated samples collected from several fields and verified higher levels of infection than expected in some clubroot resistant varieties. Further studies are…
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Resistance can lose its effectiveness when repeated cropping of a resistance source selects for individuals within a pathogen population that are virulent on that resistance. Initially, these new pathogen strains are very rare but then increase by being able to attack the "resistant" genotypes…
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Short of a stacked genetics solution and/or the development of several more distinct sources of resistance, which could take a lot of time and effort, we need to follow the risk mitigation practices to help prevent clubroot spread and protect this valuable genetic trait…
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EcoNomics. Handy graphs and calculators show the best nitrogen rate based on yield potential and appetite for risk. Is this the year to claw back or keep the pedal down with regard to N rates? Ignorance is not bliss — especially when it comes to clubroot. Early detection and adoption of resistant varieties, rotation and equipment sanitation can keep the…
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