Blackleg

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

    Blackleg

    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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  • Test blackleg races in a field; make better seed decisions

    Blackleg

    New tests allow farmers to identify the blackleg races in their fields. With this information, farmers can choose canola varieties with resistance to those races.

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  • What’s going on with the roots?

    Blackleg

    Take a random look at a few canola roots in each field to see what’s going on. Also dig up the root area for plants that look less than healthy for no apparent reason. This plant has foot rot.

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  • After the hail

    Blackleg

    How many plants recovered? Are they at early stages and at risk of heavy blackleg infection? What is the crop nutrition situation?

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  • Blackleg decision: When does a fungicide pay?

    Blackleg

    Blackleg infection at or just after the cotyledon stage is the mostly likely to cause any significant yield loss. If fungicide to control blackleg is to provide any economic benefit, it has to be applied very early in the season and the crop has to be at risk of early and fairly widespread infection. With good management, including a two-year break between canola crops, growing blackleg resistant varieties and rotation of R genes, fungicide is not necessary. In that situation, fungicide to reduce blackleg losses does not usually provide an economic return.

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  • Quick comparison: Blackleg, clubroot, sclerotinia stem rot

    Blackleg

    Use this quick-reference table to compare key distinguishing features, mechanisms for spread, and management options for blackleg, clubroot and sclerotinia stem rot.

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  • Blackleg video quiz for CCA credit

    Blackleg

    Watch the video. Take the quiz. Get 10/10 and earn one CCA CEU.

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  • Blackleg: New stubble test from Discovery Seed Labs

    Blackleg

    Discovery Seed Labs in Saskatoon is the first to offer a test of canola stubble to determine (1) if blackleg is present and (2) what race of blackleg it is. This can help farmers and agronomists make proper use of the new blackleg resistance-gene (R-gene) classification system when making seed decisions.

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  • Blackleg scouting in the fall

    Blackleg

    If you missed the swath-timing window to check canola stems for blackleg, you still have lots of time to look for blackleg pseudothecia on old canola stem pieces in fields that will go into canola next year. This can help with seed decisions.

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  • Seed: How much blackleg before I rotate resistance?

    Blackleg

    If one in 10 plants has a blackleg rating of 2 or worse, this is a clear sign that the blackleg pathotypes in a field do not align with the blackleg resistance (R) package in the particular hybrid grown. While yield loss in this situation may not be significant (each affected plant will have at […]

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