White Powder on Sago Palms: Likely Scale, Not Powdery Mildew

Reassessment

White powder on older sago palms (cycads) in Florida that covers new growth is likely cycad scale (Aulacaspis yasumatsui), not powdery mildew (rare on cycads). Scale appears as white dust on fronds, stems, and cones.

Action

Check with local garden center for cycad scale confirmation. Treat with horticultural oil or systemic insecticide (imidacloprid) per label. Multiple applications needed. Early detection is critical—scale can kill cycads.