New spring japanese maple leaves are wilting/dying
I planted a Green-Leafed Japanese maple tree late last spring. It has done well in its location all year; new spring buds covered the tree and tons of leaves started to pop out within this past month.
Over the weekend though, I noticed that most of the new leaves appeared to be wilting and/or dying! Most of them haven't even finished coming out and plumping up yet, but I can definitely tell that they look different than the newly emerging (healthy) spring leaves.
I still have about 1/4 of the branches looking (mostly) healthy but the rest of the tree looks pretty miserable.
What could be the cause of this?