Magnolia Scale: A Growing Concern for Homeowners in Grand Blanc

Magnolia trees are a special plant in many landscapes in Grand Blanc, Michigan. Known for their stunning flowers and unique forms, they are a cherished component in both residential and commercial landscapes. However, property owners may face challenges in keeping these beautiful trees healthy due to a pest known as magnolia scale.

What is Magnolia Scale?

Magnolia scale (Neolecanium cornuparvum) is a large, immobile insect that infests magnolia trees, particularly in areas like Grand Blanc. The scale insects are typically oval or circular in shape, and their size can reach up to .5 inch across. They are usually a light yellow-brown color with darker, waxy coverings. The adult insects attach themselves to branches, stems, and twigs, where they feed on the tree’s sap, weakening the tree and causing damage.

Symptoms of Magnolia Scale Infestation

An early sign of magnolia scale is the appearance of white, waxy spots on the tree’s branches and limbs. As the scale insect matures, the waxy covering becomes more pronounced, and the insects become more visible. Magnolia trees that are heavily infested will show signs of stress such as:

• Yellowing leaves or premature leaf drop
• Stunted growth
• Sooty mold on the branches or leaves, which is caused by the honeydew the scales excrete
• Branch dieback or weakened limbs

Without treatment, the tree may suffer from reduced vigor, and over time, the damage can be severe, even leading to large branch dieback throughout the tree.

How Certified Arborists Can Help Control Magnolia Scale

Control of magnolia scale requires a professional approach, as DIY treatments typically have poor results. Certified arborists are experts at identifying and treating this pest effectively. Here’s how they manage the problem:

1. Early Detection: Certified arborists know how to spot the earliest signs of magnolia scale. Identifying the issue early allows for timely intervention, reducing the overall damage to the tree.
2. Tree Health: The magnolia scale is draining the tree of water and nutrients. Proper watering and fertilization are extremely important.
3. Insecticides: Magnolia scale is very difficult to eradicate. Timing of the correct insecticides during the crawler (nymph) stage is crucial.
4. Pruning: In cases of heavy infestations, pruning out heavily infested branches may be necessary. Removing infected limbs helps prevent the spread of the pest to healthier parts of the tree.
5. Regular Monitoring: Controlling magnolia scale may require treatments over multiple years to fully eradicate. Yearly monitoring ensures the correct treatment plan is in place.

Magnolia scale can be a serious problem for homeowners in Grand Blanc, Michigan, but with the help of a certified arborist, this pest can be effectively controlled. Proper diagnosis and treatment can help protect your magnolia tree, ensuring it remains a focal point in your landscape for years to come. If you notice signs of magnolia scale, don't hesitate to contact an ISA Certified Arborist who can guide you in managing and eliminating this pest.