Posted: 03/08/2017 at 15:18
this is another thread about the same cultivar, ?same problem.
The top of your tree is dead shinygirl and I wonder if the growth at the base is from the root-stock which is the species Sorbus aucuparia by the look of it.
You won't get a decent Sorbus 'Autumn Spire' tree from what you have there. Rootstock or no, once a tree has lost its tree shape you don't get it back.