If a magnolia is losing its leaves, it may simply be undergoing a.
Mar 28, Possible Reasons. First of all, you need to rule out a nutrient deficiency in your soil. Yellow leaves on Southern magnolias can indicate that your soil has insufficient nitrogen. The only way to determine for sure whether or not this is the problem is to have a soil test done.
If the test results do, in fact, show a nitrogen deficiency, you can fertilize accordingly to raise the nitrogen shrubfall.clubted Reading Time: 3 mins. Sep 21, Examine the branches of your magnolia tree. Insects such as scale or ash whitefly can cause a magnolia’s leaves to turn yellow and fall off from feeding.
Scale bugs and ash whiteflies secrete a clear, sticky, sugary substance known as honeydew. This substance will coat the leaves and branches of a magnolia.
The honeydew is a breeding ground for sooty mold, which looks like black charcoal dust. Dec 10, If there has been a sudden frost, a heat wave or a prolonged period of drought, the magnolia leaves may be turning yellow due to weather damage.
Though mature magnolias do.