Verticillium wilt - Ask Extension
I have a large Japanese maple tree that has been healthy for over 25 years. This year one large branch is dead. How do I determine if it is verticilli...
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Verticillium wilt #132015
Asked June 04, 2013, 11:24 AM EDT
I have a large Japanese maple tree that has been healthy for over 25 years. This year one large branch is dead. How do I determine if it is verticillium wilt? If so, what can be done about it? Can the rest of the tree be saved? Also there is a black oily substance oozing from heathy looking
branches a picture of that is attached. I look forward to hearing from you. Thanks. Sondra Pearlman
branches a picture of that is attached. I look forward to hearing from you. Thanks. Sondra Pearlman
Multnomah County Oregon
Expert Response
Thank you for your question to Ask the Expert.
It is possible that verticillium wilt has caused the die back of the branch. Did this occur rapidly? This fungal disease damages the cambium tissue of plants causing a brown coloration underneath the bark. If this is a large tree, it might be difficult to remove bark for this diagnostic test. Verticillium can also lead to secondary fungal infections, which may account for the black sign on the bark of the trunk. Is this located on the same side of the tree as the branch that died?
For a large tree such as this, you might consult with an arborist (or more). They will be able to diagnose the problem and recommend a course of action for the tree.
Please let me know if you have any further questions.
It is possible that verticillium wilt has caused the die back of the branch. Did this occur rapidly? This fungal disease damages the cambium tissue of plants causing a brown coloration underneath the bark. If this is a large tree, it might be difficult to remove bark for this diagnostic test. Verticillium can also lead to secondary fungal infections, which may account for the black sign on the bark of the trunk. Is this located on the same side of the tree as the branch that died?
For a large tree such as this, you might consult with an arborist (or more). They will be able to diagnose the problem and recommend a course of action for the tree.
Please let me know if you have any further questions.
