Your tree has a spider mite invasion. Give the tree two or three THOROUGH washings with the hose. Or you can spray with a horticultural oil, or neem oil.. What ever you use be sure to get the top and bottom of the foliage. Notice all the white speckled spots on the leaves,. These are caused by the mite sucking the leaf juices out, which leaves the speckling. Good luck to you and your tree.