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     7 years ago  

    No idea about this disease but I think it cause of sell increase

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     7 years ago  

    Hello,
    It look like Black Knot Fungus
    I'm not an expert but I know you have to :
    1 : Cut the branches and stem that have knot (In winter if possible)
    2 : Burn the branches that you have cut for avoiding spreading
    3 : Use a fungicide

    I already witness black knot be treat like this in the past and it worked but I invite you to inform more about this.

    Good Luck with it :)

    [-]
     7 years ago (edited) 

    Thanks a lot brother