Clear patches of canola plants that are yellowing prematurely could be diseased. These are obvious places to start a pre-harvest disease survey. Clubroot continues to spread into new areas, so this disease is one possible cause – even in fields with a clubroot-resistant variety. In addition to the obvious patches, check a few random areas in the better producing parts of the field.

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The following table will help you identify the diseases present, which is necessary in order to make the right management decisions.

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If you saw any unexplained canola disfigurement this summer, we want to know!

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Smart phones and mobility-enabled tablets could be the most valuable scouting tools. But what else should be in your canola scouting kit?

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A pesticide rinsate biobed can prevent the environmental contamination of surface and groundwater by pesticides. Instead of being disposed of directly on land, at the edge of a field or elsewhere, the rinsate from the sprayer can be applied to the biobed (so it is contained).

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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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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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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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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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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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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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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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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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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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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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