The “excessive sap” coating cars is honeydew from aphids, not tree sap. Leaves will feel sticky; black sooty mold may appear.
Apply Bayer Advanced Tree & Shrub Insect Control as a soil drench. Imidacloprid moves to leaves, kills aphids, stops honeydew. Product link: Bayer Advanced.
Saving a Split Maple Tree with Bracing
Diagnosing a Struggling Maple: Split Bark, Black Marks & Fungi
Sticky Yellow Spots on Car? It's Honeydew from Aphids or Scale
Black Tennis Court Residue: Sooty Mold from Scale/Aphids
Coral Bark Maple Losing Bark: Sunscald, Borers, or Natural Exfoliation?
Sugar Maple White Spots: Harmless Lichens, Real Issue Likely Planting or Herbicide
Weeping Cherry Gummosis: Borer Management and Fruit Production
Mysterious White Foamy Growth on Maple Trunk: Not Slime Flux
Dealing with Borers in Plum Trees: Identification and Treatment
Japanese Maple Sunburn Recovery: Stress Management
Bacterial Wetwood (Slime Flux) in Maple Trees
Maple Tree Dripping Sap: Aphids, Honeydew, and Assessing Tree Safety After a Lightning Strike
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