snow dance lilac tree

Question

Soon after they bloomed the year, the leaves are beginning to wilt, turn brown and fall off. It is happening branch to branch and slowly spreading through the entire tree.

Answer 1

Lilac can be attacked by some pests and disease.
This article will help you determine the issue.

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm