Asian Cycad Scale on Sago Palm: Identification and Treatment Options

Recognizing the Pest

Shiny brown bumps on the undersides of sago palm (Cycas revoluta) fronds are likely Asian cycad scale (Aulacaspis yasumatsui). They don’t move and lack visible legs. This invasive scale is a serious, often fatal pest.

Management Strategies

• No guaranteed cure exists. Research (e.g., University of Florida) is ongoing.
• Foliar sprays: Products like Atomic Grow (a non-toxic foliar spray) can dehydrate scale and help wash them off. Repeated applications are needed.
• Physical removal: Scrub trunks and fronds with a soft brush and soapy water to reduce numbers.
• Systemic insecticides: Dinotefuran or imidacloprid applied as a soil drench may provide longer control but can harm pollinators.
• Severe infestations: Consider removing and destroying the plant to protect nearby cycads.

Early detection and persistent treatment offer the best chance of saving the plant.