Beginner Gardening: Oh help! What could be ailing this lilac bush? , 1 by rubia16

rubia16 wrote:
I have a lilac hedge and they are blooming right now. But the bush on the end (as well as two specimen yellow lilacs in another part) is drooping. We have had torential rains, but it looks for all the world like it is not getting water. This bush also has only one bloom, whereas the others have put out hundreds (it is a good year for lilacs, despite the rain). It is a regular purple one.

I looked up diseases of lilacs online and I am not seeing anything obvious, unless it is a weird/rare soil fugus or bug. And if this is the case, then my other beautiful bushes might be in danger too!

What can I do? Is it serious??

Let me know if you need photos or want me to autopsy a stem or something like that. I do not see any obvious bugs-- the leaves look clean to me.
Thank you!

Lisa