Live Oak Scale Infestation: Lecanium Scales and Systemic Control

Identifying the Problem

5-year-old live oak (7 ft) with black spots on branches (north side only) that brush off easily, plus sticky residue. Spots not on leaves. Photos show small black bumps on twigs.

Diagnosis: Lecanium Scales

• Insects living under shell-like covers on twigs
• Suck plant juices, secrete sugary honeydew
• Honeydew → sticky coating → sooty mold (black)
• North-side concentration: shade favors scale survival
• Shell protection makes foliar sprays ineffective

Systemic Solution: Bayer Advanced Tree & Shrub Insect Control

• Soil application around tree
• Roots absorb → translocate to twigs/leaves
• Scales killed when feeding on treated sap
• Best timing: Spring application
• Season-long protection
• Product link: Bayer Advanced Concentrate

Why This Works

Bypasses scale's protective shell by delivering insecticide through plant's vascular system directly to feeding site. Sooty mold will weather off once honeydew production stops.