Hi, 

Unfortunately at this stage we can't definitely say that it is aster yellows, or a mite, or potentially something else. You will just need to wait and monitor symptoms. If you are concerned about spread you could dig them out, and put in a pot in a quarantine area and wait and see? Or just remove them. 

You can review these links at the bottom of our Aster Yellows page for additional information on aster yellows and rosette mites and compare photos. Also feel free to send back additional photos if symptoms progress or change. 

Emily