Dwarf lilac … which is about 20 years old and has been in the same spot since originally planted

Question

The leaves on parts of the bush just started to turn brown and dry up. What would cause this to happen. A lot of the bush is turning a darker color, which suggests more of the plant will die. Can you give me any ideas of the cause?

Answer 1

This could be a bacterial blight.

Here are some links that will help you.

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

https://www.gardeningknowhow.com/garden-how-to/info/diy-bordeaux-fungicide.htm