Yellowing Sago Palm Fronds: Magnesium Deficiency or Scale Insects?

Magnesium Deficiency

Symptoms: fronds yellow from center outward; new growth develops "frizzy" top.

Treatment

Spray with Epsom salts solution: 1 tsp magnesium sulfate per gallon water. Begin regular feeding (bonsai pot has limited nutrients).

Scale Insects (Also Common on Cycads)

Check for small oval/round bumps (3–5 mm) on fronds. Sticky honeydew present. Treat as per scale protocol (scrub, oil, alcohol).

Action Plan

1. Inspect carefully for scale.
2. Apply Epsom salt spray regardless (safe, beneficial).
3. Start dilute fertilizer regimen.
4. If scale found, treat promptly.