Black Film on Multiple Trees: Sooty Mold from Scale/Aphids

Oak, maple, redbud, crape myrtle, lemon all have thin black flaky film on leaves; green underneath. Lemon nearly dead. Likely sooty mold on honeydew from scale insects or aphids.

Diagnosis

• Leaves sticky? → honeydew present.
• Look for turtle-shell scales on twigs.

Treatment

1. Systemic imidacloprid soil drench (Bayer Advanced) — kills scales/aphids feeding.
2. Apply spring (active translocation) or now if leaves not turning.
3. Takes 2 weeks to reach canopy top.

Timing Note

Fall application less effective as trees senesce. Spring treatment protects all season.