Central farm in Cayo..BAHIA..email them pics of your trees..our dwarf coconut trees got yellowing, They are not immune to the disease, only resistant, one died we saved a few by drilling holes 6 inches into the trees and injecting them with tetrocycline(sp?) every 4 days for about a month, they are great help and very nice folks. They will diagnoise the problem if images you send are able to show what the problem is.