Japanese Lilac tree losing leaves
Hi, I see a little bit of spots on the leaves, but I don’t think that’s what’s causing the leaf drop. https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/lilac/ Given that it didn’t bloom and you are having leaves dropping prematurely, I’d suggest you have an arborist come out and look at your tree. Here is a link to help with that: http://msa-live.org/certified-arborists
Thank you. I will do that.