Diseases

  • The risks from high canola frequency

    Diseases

    Blackleg disease rating: 2

    Scientific research in Western Canada has identified three factors that increase the risk of canola yield loss in short rotations. They are blackleg, clubroot and cabbage root maggot. Clubroot will drive the need for longer breaks between canola crops on more and more farms.

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  • Interpreting blackleg race ID test results

    Diseases

    Step 1. Sample Collection The ideal time to pull and assess plants for blackleg infection is at 60% seed colour change, which is around swath timing. Plants should still be green. Cut just below the crown of the plant into the root material to assess. “Look for black discolouration within the hypocotyl tissue, often appearing […]

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  • Clubroot management: Don’t wait until you see dead patches

    Diseases

    Healthy-looking plants can still have galls that release millions, possibly billions of spores.

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  • Saskatchewan updates clubroot map

    Diseases

    The Saskatchewan clubroot distribution map includes all findings of clubroot and detections of the clubroot pathogen from 2008 to 2018.

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  • Clubroot: Messages from Clubroot Response Workshop

    Diseases

    At the workshop, the 200 attendees were urged to think about actions they can take to reduce the impact of clubroot on their farms, businesses and communities. These actions includes crop rotations, sanitation, resistant varieties, reduced tillage and scouting.

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  • List of clubroot-resistant canola varieties

    Diseases

    Here are the clubroot-resistant (CR) canola varieties currently available in Western Canada.

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  • Grow CR varieties as soon as clubroot is in the area

    Diseases

    Use clubroot-resistant (CR) varieties as soon as clubroot arrives in the area. The CR trait will prevent most infection, which will help to keep spore counts low in fields that already have lower counts. With fewer resting spores in the soil, the risk of building up virulent pathotypes is reduced. List of CR canola varieties […]

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  • Seed trait priorities: Disease resistance, maturity, seed treatment

    Diseases

    When choosing canola hybrids for 2019, think through the yield, quality and profit achieved over the past few years and consider what factors may have reduced overall profitability. Add notes on harvestability. Then consider how seed traits could help manage any existing and potential challenges, reduce risk and improve profitability.

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  • How to contain a clubroot-infested patch

    Diseases

    If identified early enough and small enough, patches of soil infested with clubroot-causing Plasmodiophora brassicae can be managed in various ways to reduce the spore load in those patches and prevent clubroot from spreading beyond that patch. This excerpt from a November 2018 Canola Digest article describes patch management techniques:

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  • Terminology of genetic resistance and loss of resistance

    Diseases

    These definitions help answer questions such as: How can we lose a resistance trait? How does a clubroot-resistant (CR) variety work one year and not the next?

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  • How to test soils for the clubroot pathogen

    Diseases

    Soil tests for clubroot can have two objectives:
    1. Is the clubroot pathogen present? (Yes/No test)
    2. What is the resting spore count per gram of soil? (Quantitative test)

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  • Clubroot identified in Rocky View County southeast of Calgary

    Diseases

    Clubroot has been identified in a canola field south of Calgary in Southern Alberta. Although clubroot has been found in various counties in Alberta since 2003, this is the first confirmed case of the disease in Rockyview County. For more about the discovery and what to do about it….

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  • When is ‘too late’ to assess stubble for blackleg?

    Diseases

    Field observations suggest that blackleg may be increasing in some areas. Official disease survey results for 2018 will be announced at Western Forum October 17-19. In the meantime, farmers and agronomist may still have time to count the percentage of plants that are diseased.

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  • Clubroot management: Harvest theme

    Diseases

    By this time of year, galls may start to break-down. Decaying galls will have a sawdust-like look and texture. If in doubt, send plant samples to a lab.

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  • Disease Watch 2018: Before, during and after harvest

    Diseases

    Here is a compilation of timely disease tips based on observations in the fields this week. Look for blackleg (shown above) and clubroot in particular this fall.

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Canola Watch