You have a nasty case of scale. You can try insecticidal soap for starters. If it doesn't work you might have to pull out the bigger guns (pesticides). Malathion (make sure it is listed for duranta (gold mound)) or Bayer Tree and Shrub (used as a soil drench) or if you have a service you can have them spray.

As a last resort you can yank them out and start over with something else. Whatever you do I think it needs to be done quickly or your only option will be to remove the dead ones.

Thank you so much for your quick response! First thing in the morning I will be giving the soap a try. Thanks again!!!