How to Stop my Dying Jumbolan or Java plum bonsai

I have 4 year old Jumbolan bonsai now its green leaves new and old are turning black just like when you put excessive manure in normal plants.
similar like this:



What can do for saving my bonsai?

Thanks

Looks like a root issue. We need more info. Where do you keep this? How and how often do you water? What and when do you feed? Siunlight? Shade? What soil?

Bonsai in a sunny area. When soil dry once in a day. NOT feed since an year. How can I describe my soil?

As in the other forum where you posted this question, and some 6 people responded..

There is too little information to make an informed choice of what is causing this.

- Have you recently repotten?
- Changed fertilizing?
- where does it stand?

Have you checked whether you see any insects roaming around on the leaves?

I would guess some problem in the area of bacterial, or perhaps fungal, infection of the stems/sapwood. This sort of die-off you often see in shrubs with a fungal infection in the phloem. But as I do not know the circumstances, nor the species of plant you have there.. It is guessing for me too.

As you see in other forum I already answer these question also.
[quote="- Have you recently repotten? [/quote] NO

- Changed fertilizing?

NO

- where does it stand?"]

NO

Have you checked whether you see any insects roaming around on the leaves?

There is Nothing