Sago Palm Scale: Black Growths on Fronds and Organic Control

Identifying the Infestation

Raised black hard growths on sago palm (Cycas revoluta) frond undersides that persist despite alcohol wiping are scale insects—likely Asian cycad scale (Aulacaspis yasumatsui) or similar armored scale. The "black growths" are protective covers over feeding females.

Effective Organic Treatment

100% pure neem oil spray applied thoroughly to all frond surfaces (especially undersides) and trunk. Neem acts as:

• Insecticide (disrupts molting/feeding)
• Miticide
• Fungicide
• Repellent (residual coating deters reinfestation)

Application Protocol

1. Spray to runoff every 7–10 days for 3–4 treatments.
2. Cover undersides completely—use a sprayer with upward angle.
3. Treat in early morning or evening to avoid leaf burn.
4. Scrub off dead scales with soft brush after treatment.

Neem's non-toxic, multi-mode action makes it ideal for indoor/conservatory plants.