Answer: Unfortunately, based on your description I am not certain what has happened to your trees. There are a number of disease problems that can affect these trees, and there are abiotic causes for browning as well such as salt damage, winter sun scald damage, and so on. I would suggest you consult with a professionally trained nurseryman or arborist with experience in ornamental trees. They may appreciate a photo of the overall tree as well as closeups of the discoloration, and possibly a freshly cut sample kept cool and enclosed in a clear plastic bag. I am sorry you are having trouble with your trees.
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