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Check the leaves for spots or other signs of abnormalities.

Sep 21, Diseases like leaf spot or infestation by algae often cause a magnolia tree to lose leaves prematurely. Touch the branches of trees in which leaves are falling.

Utah State University.

Magnolia canker and scab leave lesions and holes in the bark of the tree. Verticillium wilt will cause the leaves and branches of. Jul 13, A: It takes a lot of energy for trees and shrubs to flower which often causes the plant to drop some of its leaves. Magnolias are notorious for leaf drop just before flowering.

It is especially noticeable on evergreen trees that produce large leaves and create a mess when numerous leaves appear to drop at one bushcutter.buzzted Reading Time: 1 min. Apr 12, Some species of magnolia drop their leaves naturally during certain times of the year, particularly in the spring. It is also possible that a fungus is growing on the leaves. The color of the leaves that fall from the tree is an easy way to determine whether the leaf loss is Estimated Reading Time: 1 min.

The tree itself is not in danger as long as the leaves with the fungus growing on them are immediately removed.

Dec 15, If, on the other hand, the brown leaves appear in spring, it could mean that there was frost damage. 1  The good news is that such frost damage is unlikely to kill your tree. The bad news is that it will ruin the plant's appearance for a while, and that there is precious little you can do to prevent frost damage on a mature specimen. However, if you have just brought a small tree home from the.