Bark cracking Of Magnolia

Disease Information

Bark cracking

Symptomsand damage

Bark cracking. Many magnolias are thin-barked and therefore are consid­ered susceptible to bark cracking. In particular, yellow-flowered magno­lias can be prone to bark cracking at the base of the trunk. Excess nitrogen fertilizer or warm temperatures late into the fall season can extend active plant growth. Consequently, the base of the trunk may not sufficiently harden before cold weather and freezing temper­atures may result in bark cracking .Cracked bark usually be­comes evident in the spring, but may occur due to freezing conditions anytime from late fall to early spring.


Bark cracking can be avoided by ending liquid or soluble dry fertilization programs early enough to prevent growth. Use of con­trolled-release fertilizers is generally not a problem because most of these products release substantially less nitrogen during cold temperatures. Other management tools include reducing irrigation frequency and vol­ume towards the end of the growing season to slow plant growth and allow them to adapt to cold temperatures. However, allowing the root zones of evergreen magnolias to become too dry during late fall and win­ter can lead to winter burn.

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