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CCC Blackleg and canola rotation

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    #16
    It may not be an issue as our almost continuous use of canola will quickly swallow up these limited resistances available for blackleg.

    Should the CCC be more vocal or more steadfast, not sure the wording, in the minimum 3 year or more rotation rather than provide guidelines or almost quietly agree with a short rotation?

    Comment


      #17
      Good points.

      The first one about resistance failing.
      There is always a risk that a super race
      of L. maculans may be selected that none
      of our resistance genes work against.
      But in reality, judging from the
      experience in Australia (where blackleg
      is much more severe), there are huge
      swings in the L. maculans populations
      from one race to another in a field
      simply depending on which variety is
      grown. There is data now showing that
      resistance that did not work in one year
      suddenly works great again five or six
      years later. So the solution of rotating
      resistance genes seems to give very good
      control. The theory and the practice
      seem to match up well under the very
      harsh blackleg conditions of Australia.
      There is no reason to think that it
      would be any different in Canada.

      Your second point about whether the CCC
      should be providing tools for tight
      rotations is kinda of a philosphical
      point. But I think the CCC is taking the
      right approach - our first
      recommendation for blackleg control is
      still to use a long rotation. The
      message about rotating varieties is a
      new one, so it likely is getting a lot
      more air-play right now than the long
      rotation messaging, I guess. But the
      rotating varieties message is not our
      first recommendation. Economics arguably
      has the strongest influence on grower
      planting decisions, (which the CCC has
      no control over), so growers need to
      have the information available if they
      find themselves faced with dealing with
      tightened rotations. But your point
      about us being more vocal on the long
      rotation piece is a fair one to make.

      Thanks for the discussion, wd9.

      Clint

      Comment


        #18
        Thank you Clint for taking the time to post this stuff. I appreciate it.

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