Q.lilac new growth abnormality
Is it possible that new growth that forms dense clusters of yellow and stunted leaves is caused by phytoplasmas or is witches broom? Let me know what you think.
kh0001
Answered on July 20, 2016
Sounds like a case of Bacterial Blight. This article may help you:
https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm
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