Answer: Redbuds are usually quite healthy trees, but this damp year has seen many somewhat unusual foliar problems, fungus and diseases. Unfortunately, based on your description, I am unable to determine what the cause of the problem is, although I would suspect it is a leaf spot disease related to the weather and while unsightly, may not require treatment. You might want to consult with your county extension for a specific identification of the problem and suggested ways to treat it, if necessary. In the meantime, clean up and destroy any fallen leaves to help limit chances for reinfection.
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