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I bought a big acer palmatum but ever since last summer the leaves are slowly curling up wilting and falling off. It is nearly autmn now and I do not know what it is. I check soil wetness regularly wit a water meter to make sure it is not dry or wet, i use biogold fertilizer. I am relatively new to bonsai (2 years) and really love acer palmatyum bonsai. can anybody tell me what it is I should do or dont?

I can't tell if it is outside or in, there is no problem at all with this tree it is autumn and the leaves should be abscising and dropping.

it is outside on a balcpony where it gets a little late afternoon sun and not too much wind. the leaf curling started already in the summer when the tree should have been fine. could it be Verticillium Wilt ?

No, I would think heat was the main cause, and the leaves are going to drop soon so no problem.