Answer: Unfortunately based on your description I am not able to diagnose the foliage problem on your Japanese maple. These trees are sensitive to over and underwatering, overfertilizing, chemical exposure, and even too much sun. They may suffer some transplant shock the first year especially when the weather turns hot in mid summer. On the other hand there might be an insect or disease issue. I would strongly suggest you consult with your county extension and, since this is a new plant, also with your professionally trained nursery staff to see if they can help you with a specific diagnosis and based on that, determine how to proceed. I hope it is nothing too serious.
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