Plant Health Care

Magnolia Scale: A Growing Concern for Homeowners in Goodrich, MI

David Evans, ISA Board Certified Arborist | Jul 30, 2025

Tags: Scale Insects, Tree Fertilization, Tree Spraying

Supporting image for blog post: Magnolia Scale: A Growing Concern for Homeowners in Goodrich, MI

Adult stage Magnolia scale. | Whitney Cranshaw, Colorado State Univ., Bugwood.org

Magnolia trees are a treasured addition to many landscapes in Goodrich, Michigan. Known for their magnificent flowers and unique forms, they add beauty to both residential and commercial properties, serving as a prominent feature in any yard. However, homeowners may encounter challenges in keeping these ornamental trees healthy due to a pest known as magnolia scale.

What is Magnolia Scale?

Magnolia scale (Neolecanium cornuparvum) is a large, immobile insect that frequently infests magnolia trees, especially in areas like Goodrich. These insects are oval or round in shape, growing up to 0.5 inches wide. They are typically light yellow-brown, with a darker, waxy covering. The adult scales attach to the branches, twigs, and stems, where they feed on the sap of the tree, weakening it and causing serious damage over time.

Signs of Magnolia Scale Infestation

Magnolia scale can be difficult to identify initially, but early signs include the presence of white, waxy spots on the tree’s branches. As the scale insects mature, their waxy coating becomes more noticeable, and the insects themselves become visible.

Trees experiencing significant scale infestations may exhibit signs of stress, such as:

• Yellow leaves or early leaf loss
• Slowed growth and overall weakening of the tree
• Sooty mold development, a result of the honeydew the scales excrete
• Weakened branches and potential dieback

If left unchecked, magnolia scale can inflict severe damage, weakening the tree’s structure and potentially leading to its death.

How Certified Arborists Can Help Manage Magnolia Scale

Effectively controlling magnolia scale requires a professional approach, as DIY methods often fail to deliver lasting results. Certified arborists possess the necessary expertise and tools to successfully manage and eliminate this pest. Here’s how they tackle magnolia scale:

1. Early Detection: Certified arborists are skilled at identifying the first symptoms of magnolia scale. Timely intervention can reduce damage and maintain the health of your tree.
2. Proper Tree Care: Magnolia scale robs the tree of vital nutrients and water, so proper watering and fertilization are essential to help the tree stay healthy and resilient against scale damage.
3. Insecticide Treatments: Eradicating magnolia scale can be difficult, but applying insecticides during the crawler (nymph) stage is crucial to reducing the scale population.
4. Pruning Infected Limbs: In cases of severe infestations, pruning the most heavily infested branches may need to be considered. This helps eliminate the pests and prevents them from spreading to other parts of the tree.
5. Ongoing Monitoring: Managing magnolia scale requires several treatments over time. Certified arborists will monitor the tree regularly to ensure it remains free from scale insects and continues to thrive.

Magnolia scale presents a serious challenge to homeowners in Goodrich, Michigan, but with the help of an ISA Certified Arborist, this pest can be effectively controlled. By catching the problem early and providing the right care, magnolia trees can continue to flourish, enhancing the beauty of your landscape. If you notice signs of magnolia scale, don't wait—contact Owen Tree & Lawn Care at 800-724-6680 to protect your tree and keep it healthy for years to come.

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