Q.lilac bushes
My lilac bushes sprouted in the spring but the new growth is stunted, shriveled, yellow and never grew to normal size. Other branches on the bush are normal. Now this stunted growth is drying up in the heat.

Downtoearthdigs
Answered on July 19, 2016
Your Lilac could be suffering from Bacterial Blight.
Here is an article will help you.
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm
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