Scale Insects on Houseplants: Identification & Effective Treatment

Know Your Enemy

Soft brown scale appears as small, oval, brown bumps on stems and leaves—often in lines. They suck plant sap, excreting sticky honeydew that attracts black sooty mold. Favorites: ficus, ivy, spider plants, ferns, aralia, schefflera.

Why Sprays Alone Fail

Their waxy shell protects them from contact insecticides. Mechanical removal is essential.

Step-by-Step Treatment

1. Physical removal: Wipe off bumps with your finger, a soft cloth, or a child’s toothbrush.
2. Spray with neem oil (2–3 tbsp per gallon water) to kill crawlers and deter re-infestation.
3. Clean sooty mold with the “Green Solution” (see below).

The Green Solution (DIY Insecticidal Spray)

Mild: Warm water + few tbsp biodegradable soap.
Standard: 8 oz water + 8 oz isopropyl alcohol + 2 tbsp soap + 2 tbsp mineral oil.
For palms: Omit alcohol.
Never use on fuzzy-leaved plants (African violets, begonias). Test on 1–2 leaves first. Avoid spraying in sun or on dry soil.

Persistence Pays

Repeat weekly for a month. Scale often requires multiple rounds. Isolate infested plants.