Mycosphaerella Leaf Spot on Ash

We often see a great deal of mycosphaerella leaf spot on ash trees in areas that had wet summers. This year is no exception. Small, brown spots can 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.

Articles reprinted from the K-State Research & Extension Horticulture Newsletter


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