Your search for blackleg returned 304 results.

  • Blackleg: Scouting, identification and next steps

    August 19, 2020

    Around 60 per cent seed colour change (swath timing) is the best time to scout for blackleg as the basal cankers, which cause significant yield loss, are easy to see. Check fields – even if growing resistant (R) rated hybrids. An R rating is not immunity and does not tell much about if it will be effective against the races in a individual field.


  • Last chance for blackleg control

    June 10, 2020

    Fungicide is probably not necessary in a field with at least a two-year break between canola crops, blackleg-resistant varieties and rotation of genetics. But if factors suggest a fungicide ROI, it has to be applied before the four-leaf stage.


  • Do you need to change blackleg resistance for 2020?

    September 11, 2019


  • Fungicide for blackleg: An early-season decision

    June 13, 2019

    Blackleg needs just enough moisture to enter the plant early in the season. Once inside the plant early, blackleg can produce severe cankers even with lower seasonal moisture levels.


  • Interpreting blackleg race ID test results

    February 8, 2019

    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 […]


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

    September 26, 2018

    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.


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

    September 6, 2018

    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.


  • Blackleg, foot rot or cutworms

    June 27, 2018

    These can be hard to tell apart sometimes. Pinched or otherwise damaged-looking stems can occur with all three. Here’s how to tell them apart…


  • Sentinel Fields: Blackleg on residue at Enchant, AB

    May 16, 2018

    It was too early to do emergence counts, but I did manage to find some blackleg pycnidia on canola residue from 2016. We will have to keep an eye out for the disease this year.


  • Quick comparison: Blackleg, clubroot, sclerotinia stem rot

    April 4, 2018

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


  • Blackleg video quiz for CCA credit

    March 2, 2018

    Watch the video. Take the quiz.


  • Blackleg: New stubble test from Discovery Seed Labs

    March 2, 2018

    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.


  • Blackleg scouting in the fall

    September 27, 2017

    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.


  • Seed: How much blackleg before I rotate resistance?

    September 13, 2017

    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 […]


  • Identifying verticillium. Or is it blackleg, sclerotinia or grey stem?

    September 7, 2017

    If whitened canola stems are peeling and have black spots under the peeled layer, the cause is likely verticillium. Seeing this? Please get it checked out and let us know. We’re trying to find out how widespread the disease is.


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