Triangle Palm Tree - Knowledgebase Question

Livermore, Ca
Avatar for lejoda
Question by lejoda
May 13, 2010
The trunk of my palm tree is very powdery. Is this a disease? How can I get rid of them? How should I prune the tree if I want to maintain the height instead of let the tree get taller and taller?

Answer from NGA
May 13, 2010
Triangle palm is Dypsis Decaryi and it can reach 20-30 feet in height. While you can prune off the lower fronds as they die, there's no way to keep the palm from reaching its ultimate mature height. This is because the bud at the crown of the plant continues to develop fronds during the life of the palm. If you cut or damage the growth bud, no new fronds will develop - once the old fronds die the tree will die, as well. So, I'm afraid you'll just have to let it grow. The powdery stuff on the trunk could be powdery mildew, especially if the air circulation around the palm is poor. You may be able to wash it off with plain water. If it returns, treat the mildewed area with neem oil. Don't spray the fronds, though. The oil residue will turn the leaves yellow and then brown. Best wishes with your triangle palm.

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