I have these worms in my evergreen bush that make a cacoon and attach pieces of the bush to the outside for camoflage. I am not sure what they are. They came off a bush that had died and the migrated to another bush of the same kind. The bush they migrated to is also showing signs of dying. Others have told me that they are responsible for the bush dying but I would like to know for sure. I have a short movie of what they look like but I don't know how to attach the movie file. If someone could let me know it would help.