Chum disease

Half The tree rapidly wilted and all the leaves and fruit fell off, other half healthy, but it’s spreading. Any ideas what it could be?

Look up verticillium wilt. I think that’s what your tree is getting.

I think you’re right. Looks like there’s no cure either. One source was saying to apply ammonium sulfate?

I wonder if this is the same disease that suddenly killed my kiwi vines in another part of the garden.