I have 10 lilacs that line the rear of my yard, I bought this house from my parents this year and these lilacs we doing fine for 5 years until last season they started to look like this. This year has been dry but i have watered when needed and all of my other bushes that line the yard are doing well. There is no scale that I can see on them but this year they seem to be even worse than last year. I did not do any pruning at all to them but my mother did 3 years ago. The next season they started to look like this. Please help, I cant afford to replace these and they were beautiful not long ago. Here is a link to the photos.