Any ideas on what causes brown leaf edges on rambutan?

[Jsvand5]

Any ideas? It's still really warm and pretty humid here so I can't imagine it is a climate issue. This is a grafted tree from PR. After shipping it dropped all of its leaves and died back quite a bit but sent out a new vigorous shoot and seems to be doing well. Just not sure what is going on with the leaf edges.

[fruitlovers]

Brown edged leaves very common in rambutan. Usually caused either by lack of potassium or a virus. Lack of potassium is the more common cause.

[jcaldeira]

Rambutan are also sensitive to wind.  They show brown leafy edges in windy conditions.

[fruitlovers]

Rambutan are also sensitive to wind.  They show brown leafy edges in windy conditions.

Will get brown edging even when fully protected from wind.