Answer: Unfortunately, this type of symptom is impossible to diagnose long distance. I would strongly suggest you work with your local county extension to obtain a specific diagnosis of the problem and based on knowing that, decide how to proceed. They may appreciate photos of the overall plant and closeups of the affected portions along with freshly cut samples enclosed in a plastic bag and kept cool so they stay fresh. They may even send these to a plant pathologist if they are unsure of the identification. Please don't just destroy your plants without knowing specifically what the problem is.
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