Mycosphaerella leaf spot on ash

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With all the concern about Emerald Ash Borer (EAB), many people may assume the trees are being attacked by EAB. However, EAB has only been confirmed in Johnson, Leavenworth and Wyandotte counties.
Mycosphaerella leaf spot causes small, brown spots that enlarge to become blotches and may result in early leaf drop. Though this disease looks serious, it is not. Defoliation this late in the growing season will not hurt the health of the tree. Therefore, because this disease appears sporadically and tree health is not harmed, we do not recommend treatment. Furthermore, treatment would have to be preventative and applied before the disease had infected the leaves.  Applying a fungicide now would have no effect. (Ward Upham)

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