I've planted a Yoshino Flowering Cherry Tree in my parents backyard about five years ago. It's grown from the sapling I bought off of ebay to a great looking, large tree. Then this year came along. The tree flowered as it usually does (even more this year then last) but when the flowers died back, leaves did not follow. It's been a few weeks now of just a bare tree. I've never heard of this happening before. The main trunk still looks alive as it's still green just under the bark surface, but is something in the process of killing it? Is all hope lost and should I think about replacing it now before the summer hits?
Thanks for your help!