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Thread: Chinese Elm Black spot Disease?

  1. #11
    Bonsai Apprentice
    Join Date
    Jul 2010
    Location
    NJ
    Posts
    58
    Thank you for all your help.
    I've been keeping Bonsai for a while now, but you always learn new things.

    Steve

  2. #12

  3. #13
    Bonsai Apprentice
    Join Date
    May 2017
    Posts
    1
    Hi all, i dont know if this is any help butbinhave afully grown chinese elm tree the last 2 years we have a problem with whatnappears to be black sap that falls from the tree and covers the lawn and our sons car when he parks it under the tree it is a sticky sap and leaves black residue over any plants ,lawn,and anything under the tree, I would love an answer to stop this problem or else the tree has to go cheers Carey

  4. #14
    Super Moderator
    Join Date
    Apr 2012
    Location
    Westbury
    Posts
    1,446
    That is caused by aphids. Check the leaves you will find white fly or blackfly. You need to sray with an insecticide.

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