Diseases-general-other

  • Terminology of genetic resistance and loss of resistance

    Diseases-general-other

    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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  • Disease Watch 2018: Before, during and after harvest

    Diseases-general-other

    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 quiz (survey actually) – Sclerotinia assessment

    Diseases-general-other

    Predicting sclerotinia stem rot severity is difficult. This quiz is a review of management decisions for 2018, including a specific look at DNA petal tests. Please take a minute to do this quick survey.

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  • Take time for a harvest disease survey

    Diseases-general-other

    If you didn’t get a chance to to the pre-harvest disease survey in canola fields, swathing can also be a good time to check. Get out of the swather once per hour to stretch your legs and check for disease. Clip a few stems for blackleg. Dig up a few plants to check for clubroot galls or foot rot. Give those plants a complete scan for other diseases.

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  • Start your pre-harvest disease scouting

    Diseases-general-other

    Diseases are usually easiest to see and diagnose in the couple of weeks before swath timing. Patches of dying or prematurely-ripening plants are obvious areas to scout (and show up really well with drone images), but even clean-looking fields can provide some early warning if you take time to look. Here’s how to identify the major diseases of canola as fields get close to swathing stage…

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  • Photography tips for agronomy

    Diseases-general-other

    Mystery damage to top of leaf.

    Photographs can be a valuable diagnostic tool, but they have to be in focus, taken from various angles and come with details on field conditions and location.

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  • Pre-harvest disease scouting: 8 diseases to look for

    Diseases-general-other

    Diseases are usually easiest to see and diagnose at this stage of the season. The photo shows blackleg in a clipped canola stem. Patches of dying or prematurely-ripening plants are obvious areas to scout (and show up really well with drone images), but even clean-looking fields can provide some early warning if you take time to look.

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  • Post-harvest scouting for verticillium and other diseases

    Diseases-general-other

    Verticillium on canola stems. Credit: Justine Cornelsen

    Disease scouting long after swathing is not usually the most accurate, as saprophytic organisms — those that feed on and break down dead material — move in fast and cloud the identification process. Verticillium is one disease that can be more obvious and easier to identify after cutting a canola crop.

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  • Disease scouting at harvest

    Diseases-general-other

    Harvest is a great time to assess the incidence and severity of canola diseases, an important step in management for next year.

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  • Swath timing and disease

    Diseases-general-other

    Alternaria infection

    With blackleg, sclerotinia stem rot and clubroot, base the swath timing decision on healthy plants that will contribute to yield. One exception where early swathing could provide an economic benefit is the case of severe alternaria black spot (shown).

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