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symptoms detected on the stem (4.5 m high) and low branches of Abies nordmanniana present in a private garden. The tree is approximately 110 years old and has no further symptoms
Answer
I think the canker was caused by rust Melampsorella caryophyllacearum. It makes the infectios rout for wood rot fungi, but sometimes doesnt. Hopefully the rot is not developing. If yes, look for fruiting bodies most often of Phellinus hartigii.
AK.