Knowledgebase

Brown Spots on Oak Tree Leaves #401469

Asked May 21, 2017, 6:05 PM EDT

This oak tree is 1 year old. I transplanted it 3 weeks ago. Everything was fine until this week. Please see the picture and let me know what the brown spots are and what I should do about them.

Baltimore County Maryland

Expert Response

This is Phyllosticta leaf spot, which is caused by a fungus. It is relatively common on maples, but it does not cause major harm to the trees. You can prune out and dispose of affected leaves. No other treatment is required. 

Here is additional information about Phyllosticta:
http://web.extension.illinois.edu/forestry/publications/pdf/forest_health/UIUC_Leaf_Spot_Diseases_of...

CKC
Answered by the Home & Garden Information Center's Maryland Certified Professional Horticulturists Replied May 22, 2017, 2:22 PM EDT

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