It may be from a condition known as magnolia scale. It may also cause fewer or smaller flowers and leaves than what you usually enjoy.
Dark gray nymphs overwinter, creating a red-brown median ridge on older twigs. Females give birth to live young called crawlers that wander around for a short period before settling down. They suck sap out of twigs, producing honeydew which attracts other insects.
Symptoms and signs include:
For magnolia scale treatment, apply treatments during the dormant and growing season to control all stages of the insect’s life cycle.
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