Q.Nectarine Tree Problem…
Hi, I have a Nectarine Tree and one branch is dead should I leave it alone or cut it off? Please see pictures I have attached.. Thank you so much for the help and your time..
Bill P
La Verne Ca.

In this case the only option you really have is to leave the main trunk branch.
If you prune; you run the risk of no support for the bearing branch and leave the one remaining branch open to pests and disease.
You may have to make the hard decision of whether you want to save this tree or replace it.