The two most likely culprits are that you either have tree pests or a tree.
Sep 10, Trees that lose leaves because of a full canopy lose leaves for a few reasons. First, when you have an overgrowth of tree leaves, your tree grows too many leaves to support.
In order to support as many leaves as possible, your tree will begin shedding some of the excess leaves early in the season, which is why you notice your tree losing leaves in the summer. Second, your tree may Estimated Reading Time: 6 mins. Aug 06, Learn why the leaves of your tree may fall early. Here are four reasons why trees shed their leaves in August or early fall. 1.
Pests and diseases. Leaf diseases or summer pests usually make their mark by changing the color of leaves (often, yellow) and causing them to droop or wilt. Ultimately, the infected leaves fall earlier than normal.
Several fungal diseases can cause apple trees to lose their leaves. Apple scab causes olive green or black spots on the leaves.
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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 gardener was.