Can anyone advise me what might be going on with my Japanese maple? 75% of the leaves have dried up and are falling off. One of the main branches seems to be hanging in there, but doesn't look the greatest. The limbs that are loosing leaves still have green under the bark and the bed seems to be getting plenty of water. The tree was planted about 3 years ago and I've never had any problems before. I lost two large red oaks last summer to ambrosia beetles, but don't see any signs on the maple.