These Japanese tree lilac problems cause wilting and premature leaf drop. On the other hand, too much nitrogen fertilizer can bring on bacterial blight. Keep your eye out for young shoots that develop black stripes or leaves that develop black spots. Flowers may also wilt and die.Click to see full answer. Keeping this in consideration, why is my lilac tree dying?A lack of care or a drought can cause a lilac bush to wither away. One of the main reasons why lilacs start to die back is that they are not pruned enough. When dead branches are left on the tree, they leech nutrients and water from the rest of the tree.Also Know, how do you revive an old lilac tree? One way to renew a large, overgrown lilac is to cut the entire plant back to within 6 to 8 inches of the ground in late winter (March or early April). This severe pruning will induce a large number of shoots to develop during the growing season. In this manner, what’s wrong with my lilac? Common Diseases of Lilacs Bacterial blight – The bacteria Pseudomonas syringae causes early shoot and branch dieback, distorted leaves and leaf spots that start out olive green, but soon develop water soaked areas. Powdery mildew – Powdery mildew is probably the most common problem in lilacs.How long do Japanese lilac trees live? 40-50 years
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