Controlling Scale Insects on Spider Plant and Yucca

Scale Insects: Identification and Treatment

Scale insects are common on spider plants (Chlorophytum comosum) and yuccas. They appear as small, oval, translucent bumps on stems and leaf undersides, later developing hard brown shells. Their sticky honeydew is often the first sign noticed.

Effective Non-Toxic Treatments

1. Rubbing alcohol spray: Mix 1 part isopropyl alcohol with 5 parts water + a drop of liquid soap. Spray thoroughly, covering all surfaces. Repeat in 5–7 days.
2. Brand X Foliage Cleaner (silicon-based, penetrates crevices) – available from Southwest Plantscape Products (1-800-333-7977).
3. Sun Spray Ultra-Fine Horticultural Oil – smothers scale; complete coverage essential.
4. Hot Pepper Wax – cayenne-based; repels and kills pests.
5. Neem oil – dilute with water and a little Pine-Sol to reduce odor.

Critical Application Rules

• Treat in early morning or evening—never in direct sun or high heat.
• Drench all leaf and stem surfaces until dripping.
• Repeat treatment to catch newly hatched crawlers.
• Inspect weekly for recurrence.

Quarantine affected plants. Scale spreads easily to nearby plants like your yucca.