Answer: Unfortunately, based on your description I am unable to diagnose the problem for you long distance. It might be heat stress or related to poor rooting, or it might be a disease problem. I would suggest you work with your county extension and/or professionally trained nursery staff (especially if there is a warranty involved) to get a firm diagnosis and then knowing that, determine how to proceed. If it is something that needs a chemical control your county extension will have the most up to date information on what to use and how/when is best to apply it. I am sorry I can't be more specific for you and I hope it is nothing too serious. Good luck with your tree!
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