Cymbidium Whitish Crust: Boisduval Scale Treatment in Sydney

Diagnosis

Whitish crusty coating on leaf undersides = Boisduval scale. Sucking insects kill slowly over years.

Treatment

1. Wipe leaves with isopropyl alcohol on soft cloth.
2. Systemic insecticide (orchid-safe) drench: 3× at 1-week intervals.
3. Many hide in mix—persistence needed.

Bloom Note

No spikes by winter = no bloom this year.

Sydney Culture

• Excellent for Cymbidiums (good light).
• Water more in heat (>20°C), less in cold (<10°C).
• Fertilize spring–fall.