Have 4,avocado 3 mango saplings 25 weeks old,one avocado leaves turned brown , fell of,now 1 , mango ,ITALY?

I live in Italy,Have a small garden,of the 4 avocado and 3 mango plants 25 weeks old,one each avocado & mango, the leaves turned brown,avocado has shed all leaves,mango has not yet shed the leaves,other plants all are healthy.

Answers:
I think there's a problem. Your trees shouldn't be shedding right now and they seem so young. What kind of climate do you have there in Italy?

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