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Disease management

The following articles are categorized as 'Disease management'

• Rotations for pest resistance management

  Lack of crop diversity can increase the density of pests in a field. The higher the population of a pest in a field, the higher the risk of developing resistance to the pesticides (herbicide, fungicides or insecticides) used for controlling the pest in those fields.

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• Rotations for disease management

  Blackleg resistance is starting to show cracks in some areas where tight canola rotations have become normal practice. This is a reminder that the long-term viability of genetic resistance does require some rotation management on the growers’ part. This may be particularly true for clubroot resistant canola varieties, which have become a key clubroot management tool for growers with heavy clubroot infestations.

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• Clubroot intensifies, check fields

  Two cases of clubroot have been confirmed in Saskatchewan. Growers in fringe areas where clubroot is at low levels or has not yet been detected are encouraged to check their fields. If clubroot is present but undetected, then growers, custom operators and whomever else visits the field can spread infested soil throughout the farm and to neighboring farms that much faster.

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• Clean equipment to limit disease spread

  Growers considering tillage for fall weed control should clean equipment between fields to limit disease (and weed seed) spread. Tillage equipment carrying soil and stubble from field to field can also carry soil- and stubble-borne diseases such as clubroot and blackleg.

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• Look for clubroot as it expands toward Sask.

  Clubroot damaged canola plants have been spotted in a few new regions of Alberta this fall. Clubroot infected canola will often ripen prematurely. For this reason, clubroot infection is often confused with heat stress or other diseases such as sclerotinia, fusarium wilt or blackleg. Proper diagnosis of clubroot should always include digging up plants to check for gall formation on roots.

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• Alternaria can make hailed pods brittle

  Alternaria has infected the pods of many hailed crops. Keep watching these crops. When infected areas make up 50% or more of the crop, swathing early may be the best way to salvage the yield in those infected plants if a large proportion of pod surfaces are covered with the black spots. Read more to see photos of alternaria infection.

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