The sugary substance is honeydew from mites/aphids. For a 20+ year maple, treatment options (systemic insecticides, horticultural oil, timing) require professional assessment.
Contact Jim Hyland, Allexperts Tree Expert (Home → Garden → Trees), former U.S. Forest Service, for specific control recommendations.
Black Knot Disease on Prunus (Plum/Cherry): Hard Black Galls on Branches—Prune or Remove Tree
Mini Trees for Florida: Conifers, Palms & Flowering Shrubs
Tree Ring Block Math: How Many Curved Blocks for a Circle?
Should You Move Mature Oak Trees Near a Fence? Cost, Timing, and Alternatives
Building a Tree Bed Retaining Wall: Back Side Materials When Hidden by Fence
Tree Galls on Chinaberry and Goldenrain: Identification and Low Concern
Ficus Gall: Bacterial Growth with No Cure
Indoor Orange Tree Care in Cool Climates
Hydrangea Tree Leafs Out Late After Improper Pruning
Saving a Struggling 'Jane' Magnolia: Planting, Fertilizing, and Troubleshooting
Persistent Spider Mites on Burning Bush: Ongoing Treatment and Neighborhood Management
To Deadhead or Not: Grooming Tropical Hibiscus for Appearance
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