Answer: The white substance might be powdery mildew, a fungal disease or it might be mealybugs or scale insects. If this is the case, the Organocide won't affect them. Try removing the substance and looking at it with a magnifying glass. You should be able to tell if it is a fungus or if you can spot insect bodies. Neem oil will kill the insect pests. Good luck with your palm.
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