This is not what I would expect from aster yellows. Often the heads of infected coneflowers will produce abnormal leaf growth. The petals will frequently be almost a lite lime green color. The one leaf that you are holding in the image has old skins of aphids (white "ghost" aphids) and sooty mold that grew on honeydew produced by the aphids. The other image of foliage may be the result of a disease but one that I can diagnose from the image. The plant, roots and all, need to be taken to a plant clinic for analysis. Contact your local extension office for assistance in getting samples to the LSU plant diagnostic clinic. Your local extension office there is Jefferson Parish is located at the following address and telephone number: 
101 Efferson Hall
Baton Rouge, LA 70803
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Here is a link to an article on aster yellows: https://bygl.osu.edu/node/1634

This is extremely helpful. Thank you so much! I was super worried. 

You are welcome.