Answer: Unfortunately, based on your description I am not sure what has affected your tree. It might be a disease or insect problem, it might be a reaction to the sprays, it might be due to poor rooting and thus moisture stress. This type of symptom is very difficult to diagnose long distance and I hope it is not too late to save it. I would strongly suggest you work with your county extension to obtain a specific diagnosis and then knowing that, determine how to proceed. If it is something that requires a chemical control they will have the most up to date information on what to use and how/when is best to apply it. Good luck!
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