lilac bushes

Question

Why are the leaves on some of the lilac bushes shriveled and yellow and the new growth is the same while other leaves and branches on the same bush appear normal?

Answer 1

Curling and yellowing leaves can indicate a pest issue or even a disease.
This article will help you pinpoint the issue.

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