Q.Rhododendron trunk rot caused by possible parasite or age.
The blooms are fine but half the main trunk seems to be rotted or eaten away by a bug. Can the hollow be filled with tar or cement? Will send pictures shortly.
Downtoearthdigs
Answered on May 22, 2018
This sounds like Rhododendron Stem Borers.
These articles have more information.
https://www.gardeningknowhow.com/ornamental/shrubs/rhododendron/issues-with-rhododendrons.htm
https://www.gardeningknowhow.com/ornamental/shrubs/azalea/azalea-branches-dying.htm
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