Problems With Magnolias

Southern Magnolias present challenges to gardeners

If you are a hardy gardener who thrives on challenges the southern magnolia may offer a delightful gamut; from sensitivity to injuries, leaf drop and as an item on the insect food chain.

Despite the popularity of southern magnolias, the tree is only moderately rated as a shade tree in Georgia. Due to several problems: southern magnolias have heavy leaf drop, some serious insect problems, and are sensitive to injuries.

Leaf drop…

Before planting a southern magnolia, be sure heavy leaf drop doesn't bother you. Leaves will fall off throughout the year, but especially in the spring and fall. Spring is the season for leaves on evergreens, such as the magnolia, to turn yellow and drop off.

Leaf spot…

Leafspot also causes leaves to fall off. Spots are usually caused by either algae or fungus, and you can treat it by spraying with a fungicide at the proper time.

Scale and leaf miners…

Magnolias have two serious insect problems: scale insects and leaf miners. Scale insects look like miniature seashells and feed on young twigs. If uncontrolled, they can weaken the tree. Leaf miners feed on the inside of the leaf tissue. As the name implies, they mine out the inside of the leaves. There is no control, at present, for leaf miners.

Injuries can weaken tree…

The trees are also vulnerable to diseases that enter through mechanical injuries. So, be careful not to skin the trunk with the lawn mower.

Roots are sensitive…

Magnolias are also sensitive to placing soil on their roots. If you cover the roots of a magnolia with much soil, the tree will die. The trees are also subject to root rot, so you should plant the tree on natural ridges or gently sloping ridges, in rich, slightly acidic soils .

Southern magnolias are beautiful trees, but do have some inherent problems. Forwarned is often forearmed.

For more information on problems with Magnolias; contact your local County Extension Office.