Hello, I have a curry leaf tree which had some serious black spot problems last year, leaves were great looking when they grew new but shortly after they began having black spots and they wilter, die and fall, new leaves would grow and same cycle again. This is a small tree and this problem is preventing it from growing as all branches are leafless after a while. This year, new leaves started coming out but the same problem still remains unresolved. I would really like to help the little guy, I have sprayed it with neem oil plenty of times in between last year and now but it seems to do nothing. I'm attaching some pictures so you can see his current situation. The black spots cannot be rubbed away, they are part of the leaf and I see no bugs in the plant. Any help is greatly appreciated, thanks for your time!