Yellowing Sago Palms in Florida: Could Be Cycad Aulacaspis Scale

Identifying the Pest

Cycad aulacaspis scale (CAS) appears as white, snow-like coating on fronds and stems. Infested sagos yellow, decline, and die without treatment.

Check frond undersides and trunk for white crust.
If present, spray horticultural oil (e.g., Ultra-Fine) thoroughly, covering all surfaces.
Repeat 3 times at 10-day intervals.
Systemic imidacloprid drench provides longer control.

Excessive rain can cause temporary nitrogen leaching; fertilize with palm formula after scale is ruled out.

Early detection saves the plant; CAS spreads rapidly in Florida.

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