Is there anything I can do to keep the tree healthy and fix.

Several fungal diseases can cause apple trees to lose their leaves. Apple scab causes olive green or black spots on the leaves. Leaves eventually drop from the tree. Rust causes orange spots on the leaves.

The infested leaves will eventually drop from the tree. The alternate host for this tree is the evergreen red cedar (Juniperus virginiana). This may have been the"pine tree" your experienced. A shortage of nutrients can cause leaves to not develop properly.

In this case, leaves will gradually yellow and fall off. Like most plants, the main nutrients that apple trees need are nitrogen, phosphorus, and potassium (NPK). However, the primary nutrient that causes leaves to yellow is a lack of nitrogen.