Pin Oak Sap Rain: Aphid Honeydew, Not Root Damage

Pin oak "raining sap" on one side after cement patio installed near roots last fall. Stop sap?

Real Cause: Aphids

"Sap" = honeydew from aphids/scale on leaves. Patio timing coincidental.

Control

• Foliar systemic insecticide (professional for large tree)
• Or soil-applied systemic (roots transport to leaves)
• Ask nursery for tree-aphid systemic