Our ten-year-old Yoshino Flowering Cherry tree bloomed beautifully this past...
Our ten-year-old Yoshino Flowering Cherry tree bloomed beautifully this past spring, but about a week ago I noticed that its leaves are beginning to drop. It also has some vertical splits in the trunk about a foot from the ground. The tree is in full sun at the corner of our lot near the street.
Send digital photos of the whole tree and the trunk so we can see what you are referring to. Many cherry trees have been affected by cherry shot hole, a fungal disease. You may notice yellow leaves with reddish brown spots. The fungus overwinters on fallen leaves, and good control can be achieved by raking and removing all cherry leaves from the planting area. No chemical control is recommended.
The splits in the trunk may be growth cracks. See our website http://extension.umd.edu/hgic/shade-trees-frost-cracks-sunscald-growth-cracks