Oak "Sap" Problem: Actually Honeydew from Insects

Real Cause: Insect Honeydew

Sticky, messy "sap" on oak is almost certainly honeydew excreted by aphids or scale insects feeding on leaves/twigs. High sugar content makes it sticky and attracts sooty mold.

Solution: Control the Insects

Apply Bayer Advanced Tree & Shrub Insect Control (imidacloprid) as soil drench. Roots translocate to foliage, killing sucking insects when they feed. Takes ~1 week to reach canopy.

Application

• Purchase at local nursery
• Follow label for trunk diameter rate
• Mix with water, pour around base
• Reapply annually if needed

Protected Tree Note

Since tree is protected, systemic treatment is ideal - no spraying, minimal environmental impact.

Product Link

Bayer Advanced Tree & Shrub Insect Control