Crown or Collar Rot suspected on 4 year Rubinette Apple Tree

Discussion in 'Fruit and Nut Trees' started by Jim Porter, Aug 13, 2002.

  1. Jim Porter

    Jim Porter Member

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    Please confirm if the above is true accoprding to the attached photo. Drenchin the roots with Ridomil 26 was suggested. I have Laters Vebomyl 50 Sysremic Fungicide which is recommended for Clematis stem rot. Is this OK to use.
     

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  2. Jim Porter

    Jim Porter Member

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    Re Crown or collar rot.

    Correction to previous email Laters --- should read Benomyl Sysremic Fungicide.

    Jim Porter
     

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  3. HortLine

    HortLine Active Member 10 Years

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    The affliction of the tree in the photograph doesn't appear to be crown rot or collar rot- crown rot attacks at the junction of roots and trunk, and collar rot infects just above the soil line. The infections shown are too high to be either. It's difficult to tell from the picture, but it would seem to be a canker disease.
    We refrain from recommending chemicals of any kind, particularly if the disease is unknown, as it would likely have no effect. Ridomil would not cure the tree in any case, it merely prevents the fungus from sporulating, and once the chemical has left the area, the fungus will grow once again.
    From the photograph, the injury to the tree seems to be quite severe, and most likely it will not survive. The best bet, unfortunately, would be to remove the tree and start over.
     
  4. Jim Porter

    Jim Porter Member

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    Crown or Collar Rot suspected

    The advise received suggests destroying the two trees, which have an undiagnosed problem, a 4 year Rubinette and a 4 year Egremont.

    I have lived on this property, in North Vancouver for 38 years. In the past we have succesfully grown fruit producting apple, pear and plum trees until after many years we removed them.

    In consideration of attempting to successfully grow replacement trees it would seem wise to first diagnose the existing problem. Otherwise the result may be repeated. How can this be done?

    Jim Porter
     
  5. HortLine

    HortLine Active Member 10 Years

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    We would suggest that you call an arborist to help you diagnose the problem. That would give you the most definite answer, better that we can give from a picture. Good luck!
     

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