Brown Scale on Phalaenopsis: Alcohol & Systemic Treatment

Mary's Phalaenopsis had small brown raised spots on leaf undersides, releasing sticky liquid when removed.

Diagnosis: Brown Scale

Scale insects suck sap (sugar-rich → sticky). Life cycle: mobile crawlers (camouflaged) → sedentary adults with brown shells.

Treatment Protocol

1. Weekly removal: Cotton/cloth soaked in 70% isopropyl alcohol. Wipe all visible scales.
2. Repeat weekly 3–4 weeks to catch hatching crawlers and hidden adults.
3. Systemic insecticide (e.g., Bonide Eight, DiSyston) after initial cleaning—kills feeders internally.

Persistence Is Key

Eggs hatch over time; hidden crawlers emerge. Consistent weekly alcohol + systemic breaks the cycle.