You need to fertilize and if you can add the micro nutrients that might help. Mine was like that from being manganese deficient.

it could be something called T scale, something like that and its very common down in the south but if you live up north the T scale wont effect your sago. So you have to do some research to find the remedy for T scale. and take davids advice, it could just be malnutrition.

Yup Sago Palms are exotic and very finicky. Im trying to find a good website that has info on the sago palm myself... have any good sites anyone...

Thanks for all the great tips.
I gave the sago a good dose of liquid fertilizer. I am still reading the website cycad jungle and looking up on t scale. There is a nursery here that only sells palm trees and they had no idea what it was or what to do. I have looked around the island and at the other palm trees and don't see any with anything similiar. They all look healthy.
But now I see one of my other sagos starting to fade away also.
I hope I can save them.

Thanks again.