Old leaves of jackfruit drying out and falling down

Question

I have a small 2 year old tree. Recently mainly lower leaves started to dry out and fall of. As main instruction say i added some universal fertilizer, but nothing actualy change. Really hope you can help me with it.

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Answer 1

Moscow, Russia? For a tropical tree? It doesn't stand a chance.
The photo of the discolored, disfigured leaf appears to be indicative of a micro-nutrient deficiency. But its impossible to diagnose without a photos of the entire tree and the site, and more information on the growing conditions, soil and water management.