Hi. I transplanted an old lilac last year, splitting it into two bushes because it needed it. They both seemed to thrive the first year, and bloomed better than they had in many years (more sun). But last summer, the leaves on one of them started curling and it died within a month or so. This year, the second plant bloomed profusely, but in the past week it has started with the same curling leaf problem. (They are not located close to each other.) I've seen that there are brown spots on it - I've attached a photo. Is there anything I can do to save it? This is an old variety of lilac - it was here when we bought the house 35 years ago. I'd like to save it if possible, but if it's not, can I replant a new variety of lilac in the same place? Any advice you can provide would be really helpful. You've always been a big help in the past; I really appreciate your assistance.