Canker, but no leaf, shoot, or berry symptoms

Botrysphaeria Dieback

Since you have not seen any of foliar or shoot symptoms, the canker or brown discoloration of the vascular system you have seen is most likely due to infection by Botryosphaeria.  Please click this link to learn more about Botryosphaeria canker.

Also, cankers can be caused by abiotic factors.  Please click this link to learn more about abiotic disorders.

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