Q.weeping cherry tree’s yellow leaves
I planted a healthy weeping cherry tree in April and did so according to nursery’s directions. It’s been doing well until three weeks ago when some leaves began curling–sprayed with organic insect killer (for aphids, etc.). Leaves still curled but new leaves are not; now many leaves are turning yellow w/tiny black specks. Please help, as this tree has sentimental meaning. Thank you.
It sounds like the tree has been stressed by lack of water. If it's still in the container, soak it overnight in a tub of water. If it's in the ground, slowly water with 10 gallons of water over a one hour time period. If it is water stress relates, the yellowing and dropping of leaves should lessen.
Since you didn't indicate your USDA hardiness zone, the leaf drop could be nature doing her thing. All cherries in our area (6b) are completely leafless.