plum tree leaves
What causes plum tree leaves to shrivel up as they open? The leaves grow then curl and shrivel and do not develop properly.
One of the most likely causes is leaf curl plum aphids - https://www.gardeningknowhow.com/edible/fruits/plum/control-leaf-curl-plum-aphids.htm
There are many problems that can beset plum trees; read more here: https://www.gardeningknowhow.com/edible/fruits/plum/plum-tree-dropping-leaves.htm
A positive identification could be made by your local Master Gardener program; this link will help put you in touch: http://mastergardeners.org.uk/get-involved/find-your-nearest-master-gardener/