Identification: Japanese maple potential disease identification

Discussion in 'Maples' started by Joseph Klomp, May 22, 2020.

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  1. Joseph Klomp

    Joseph Klomp New Member

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    Can anyone help identify this marking on my 10 yr old seiryu?

    I recently pruned this branch (pic attached) because it was problematic to growth, but there is another branch still on the tree with similar spotting and still showing new growth.
     

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  2. emery

    emery Renowned Contributor Maple Society 10 Years

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    Hello Joseph,

    It's just a guess, but it looks like mechanical damage followed by bacterial entry causing the blackening. Hard to say what might have caused the damage, might be birds of some sort. Not much to go on.

    You can treat the bacterial issues with copper pulverization, if the injured branches are shaded they should be able to heal over the course of the summer season.

    HTH, Emery
     
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  3. AlainK

    AlainK Generous Contributor Forums Moderator Maple Society 10 Years

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    Same opinion: we can see some sort of parralel scars in particular at the bottom of the branch.
     
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  4. Joseph Klomp

    Joseph Klomp New Member

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    That makes sense. I acquired the tree from a site that may have been trimmed with poorly cleaned tools. Thank you very much for your replies. I feel very supported. :)
     
  5. kbguess

    kbguess Active Member 10 Years

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    Did Chicago area have cicada last year? Looks remarkably similar to damage I saw from cicada in Iowa in 2007
     

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