Hi,
this winter I’ve noticed some orange spots on my sharp’s pigmy nursery stock. According to a google picture search it’s nectria cinnabarina for which there is no cure.
Is this correct? If so, would it be safe to air-layer the other branches or are all parts of the tree infected now? If it is only a local infection where the spots are visible I was actually thinking of making a diagonal cut, to remove the left part and grow the right branch as a new leader.
What do you think?