Answer: Unfortunately, based on your description I am not certain what is happening to your tree. These trees are usually quite trouble free although with occasional incidences of a few problems; of the typical list of suspects the only one that would come faintly close to what you described is powdery mildew. But as an experienced gardener I think you probably would have recognized that. So I would suggest you consult with your retailer and/or professionally trained and certified arborist and see if they can identify the problem for you. Then, based on that, you can determine how to proceed. I'm sorry I can't be more specific for you long distance. I hope it is nothing serious.
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