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Magnolia Scale on Historic Tree: Systemic Treatment

Diagnosis

White powdery bumps on branches with heavy honeydew ("raining sap") indicate magnolia scale.

Treatment

Soil-applied imidacloprid (Bayer Advanced Tree & Shrub Insect Control). Roots move it to canopy; scales die feeding. Best for large trees where spraying is impossible.

Trees: Deciduous Magnolia Dormancy: Velvet Buds and Leaf Drop Explained; Japanese Magnolia Near Sidewalks: Root Barrier or Transplant; Magnolia Tree Yellowing After Yard Renovation: Root Damage Suspected; Magnolia Bark Splits: Normal Sloughing, No Treatment; Magnolia Bloom Failure and Trunk Lichens: Nutrition & Cosmetics; Magnolia Root Damage from Patio Installation: Emergency Care; Cottony Scale on Magnolia: Not Fungus, But Insect Infestation; Identifying a Non-Blooming Magnolia as Possibly Fraser Magnolia; Magnolia Tree Decline: White Bark Growth and Leaf Spots in Fort Worth; Magnolia Shrub vs. Tree: Pruning to Tree Form Anytime

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