Garden Pests and Diseases: What is wrong with nt Lilac?, 2 by Gitagal

Gitagal wrote:
Here are looking at the whole bush, and how it is located, from 3 different angles.

Pic, #3 is taken from the garden side. It gets a bit more light there--
but not much--as you can see it is pretty much under the canopy of the big maple tree--
as is most of my back yard.

I am not an expert on this--but I do think it is not a "disease" per say.
It seems to be more of a situational issue.

Thanks again. Look forward to your ideas.

Gita