Sycamores can have problems with powdery mildew.
Powdery mildew, Microsphaera.
Heavy coating of whitish gray, powdery growth usually on the upper surfaces of the leaves. Some distortion of leaves and young shoots may occur if infection is early in the season. London plane trees are particularly susceptible.Rake and remove fallen leaves. Since this disease is usually not a serious problem for the health of the trees, treatment is usually not necessary.
Wet weather will bring this problem on - ususally in the spring. As weather gets warmer, it generally goes away on its own.
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