Brown Bumps Under Orchid Leaves: Scale Insect Identification and Eradication

Diagnostic Test

Small brown round growths under leaves on healthy, blooming plant? Alcohol-dipped Q-tip test: if they wipe off easily = brown scale insects.

Why Scale Are Dangerous

Sucking insects that multiply rapidly, form colonies, crawl to all plant parts, and eventually kill the host. Adults (visible scales) protect eggs and crawlers underneath.

Treatment Protocol

1. Remove visible scales with alcohol-soaked cloth/cotton
2. Apply systemic insecticide (garden center) for hidden crawlers/eggs
3. Systemic enters plant tissue, kills as they feed
4. Monitor weekly for recurrence

Life Cycle Awareness

Crawlers (mobile juveniles) spread before forming protective scales. That's why spot cleaning fails—systemic reaches all stages.