The more you learn about the pests that can cause problems for your plants, the less 'worried' you will become. Please understand that your best weapons against these pests have little to do with creepy crawlies, but everything to do with plant health, vigor, and balance. Providing good growing conditions for your plants is essential, and that means a fast-draining (very porous) potting medium, ideal sunlight conditions, a balanced and conservative fertilizer program, proper watering, etc. If you are truly apprehensive about pests, then perhaps you should consider doing what I do: keep your plants inside all year 'round. I've not had any kind of critter problem in many years. Any newcomer to the collection is treated to an isolation period, sprays with rubbing alcohol and water, and lots of scrutiny until I allow it to share shelf space with my older plants.

Unless you're a severe sufferer from "entomophobia" as some folks are, I'd not even worry about it unless you see obvious signs that those insects are injuring the palms. It's obvious thst some nocturnal insects may hide in various spots on plants during the day, quite near their food source, but not always , and they may be harmless, and just avoiding daytime predators. It does bring to mind our most common pest here , the earwigs, that will hide during the day and then may go some distance to feed on their favorite foods come nightime, or in some cases will hide right within their food source in the case of some flowers, during the daylight hours.

OK...links with photos here....(3rd photo shows nudules that seem to be more prevalent on the trunk of this tree than the others). http://www1.snapfish.com/slideshow/AlbumID=248783149/PictureID=8822596012/a=104491102_104491102/t_=104491102 http://www1.snapfish.com/slideshow/AlbumID=248783149/PictureID=8819932012/a=104491102_104491102/t_=104491102 http://www1.snapfish.com/slideshow/AlbumID=248783149/PictureID=8819933012/a=104491102_104491102/t_=104491102 At least I think these are the links. The one to the whole album is below....last 3 are the palms. Here is a link that might be useful: Album w/ Photos...last 3 are palm.

It won't hurt the other two. That is three palms planted together, not a single plant.