Red Oak Disease - Knowledgebase Question

Question by mikebrat10
July 6, 2007
I recently planted a young southern red oak that had noticeable tiny spots on some of its leaves. Although the tree is growing successfully, the tiny spots are multiplying and covering more of the leaves. The spots are dry and brown and speckle the leaves as they multiply. The appearance is awful. I would like to know what type of disease this is, and how it can be eradicated.

Answer from NGA
July 6, 2007



That is a fungal leaf spot disease. This year's rainy conditions have made them worse than normal. I would ignore it and it will not usually keep on infecting new foliage so much after the summer heats up and dries out a little. Fungicide sprays containing chlorothalonil can be helpful if used following rainy periods but I don't consider them necessary and this disease won't kill your tree.

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