[JoMar]

Water. We have a bubler for each palm tree and it runs 7 minutes, 3 times per week during April through September, then twice a week from October to March (times are after the seasonal adjustment). I originally ran it for less than that and had the same condition as you have. Increased the water and it went away. That worked for us.....but suggest you find someone that knows palms, Master Gardner, USF Ag department, the County Gardner or a long term palm tree dealer/grower that you can trust. We also fertilize the palms every 4 months and Deans sprays for insects. But first, you need to figure out what you are dealing with.