Aster yellows is caused by a tiny organism called a phytoplasma. The phytoplasma is spread from plant to plant by leafhoppers, which feed on the sap of the plants. Since no treatment is available to save an infected Echinacea, Aster yellows is best managed by removing infected plants and controlling leafhopper populations.
I had this on one of my Razzmatazz several years ago. I had no idea what was wrong with it. It came up stunted and had green yucky distorted blooms just like that picture. I pulled it up because it was so ugly and I knew something had to be wrong with it.
