Asian Cycad Scale on Sago Palm: Identification, Spray Schedule, and Monitoring

Specific Pest

Asian (white) scale (Aulacaspis yasumatsui) — attacks cycads (Cycas revoluta, C. rumphii). Can kill mature plants if unchecked.

Identification (Use Magnifier)

• Adult females: round white dots, 1/16", waxy cover.
• Males: same size, thread-like.
• Crawlers: tiny yellow specks, mobile (wind-dispersed).

Chemical Control Regimen

1. Remove only dead/yellow leaves (keep green for energy).
2. If thick white crust: jet-spray water to remove excess (don't damage leaves).
3. Let dry. Mix insecticidal oil per label; add dish detergent to reduce beading on waxy leaves.
4. Spray thoroughly, especially leaf undersides.
5. Repeat weekly for 4–5 weeks (oil doesn't kill eggs; must catch hatchlings).

Monitoring for Live Scale

Rub finger across white coating. Orange smear = live insects → restart spray program. Dry/flaky = dead.

Long-Term

Natural predators are best control but take time to establish. Continue monitoring.