- Syringa reticulata amurensis: Dominantly seen in the northeastern parts of China and a few portions of southeast Russia.
- Syringa reticulata pekinensis: Originated from the central Chinese subcontinental regions.
- Syringa reticulata reticulata: Mostly grows in Japan and surrounding areas, as well as in North America.
In case of leaf blotches, dark brown spots appear on the leaves that may be caused due to various fungi. The formation of a white-colored, fine, soft substance formed due to wet weather is called powdery mildew. When black spots appear in the form of stripes or lines on the lilac plant, it is affected by the disease called bacterial blight. The disease that involves an abnormal growth of warts or lumps on the lilac stem is called bacterial crown gall, while wilting consists of weakening of the branches due to fungal infections, which might lead to them dropping off.