Troubleshooting
Cuban Royal Palm problems — and how to fix them
Cuban Royal Palm (Roystonea regia) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Lethal yellowing disease
A phytoplasma spread by the planthopper Myndus crudus causes progressive frond yellowing and premature nut drop followed by death of the growing spear; Roystonea regia is susceptible — use oxytetracycline injections as a preventative in affected areas.
Ganoderma butt rot
The fungus Ganoderma zonatum causes internal trunk decay, visible as conks (shelf-like fruiting bodies) at the base; there is no cure — infected trees must be removed and destroyed.
Potassium and magnesium deficiency
Widespread in alkaline sandy soils of South Florida; symptoms appear as necrotic spotting on oldest fronds (K) or interveinal chlorosis (Mg) — apply palm-grade fertiliser with chelated micronutrients.
Prevent cuban royal palm problems before they start
Most cuban royal palm issues are care-mismatch, not bad luck. Dial in the basics:
Looking for cuban royal palm in general rather than its problems? Read the full cuban royal palm care guide — light, water, soil and feeding.
Cuban Royal Palm problems — FAQ
Why is my cuban royal palm lethal yellowing disease?
A phytoplasma spread by the planthopper Myndus crudus causes progressive frond yellowing and premature nut drop followed by death of the growing spear; Roystonea regia is susceptible — use oxytetracycline injections as a preventative in affected areas.
Why is my cuban royal palm ganoderma butt rot?
The fungus Ganoderma zonatum causes internal trunk decay, visible as conks (shelf-like fruiting bodies) at the base; there is no cure — infected trees must be removed and destroyed.
Why is my cuban royal palm potassium and magnesium deficiency?
Widespread in alkaline sandy soils of South Florida; symptoms appear as necrotic spotting on oldest fronds (K) or interveinal chlorosis (Mg) — apply palm-grade fertiliser with chelated micronutrients.