Fungus loves rain and wind to move the fungal spores and promote infection.
Remember to rake up your leaves and remove them because they harbor fungal spores.
To battle this you need to think preventive first; on sycamores we see better results when we do a Fall application with a Arborsystems injection of fungicide into the cambium layer so the fungicide is in the bud of the tree when the fungus attacks.

You can also do a spray that can help but timing is everything and the label calls for multiple sprays which can get expensive.
More information
http://ohioline.osu.edu/hyg-fact/3000/3048.html
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