The flower pictured is too immature to judge whether or not it is diseased. Most of the time, Echinacea petals are green before fully expanding and changing color. If a plant is infected with Aster Yellows, the symptoms will become more prominent and distinctive over the course of the summer, at which point, affected plants can be removed if it's determined that mites are not responsible for flower abnormalities instead.

Miri

 A few years ago I did have aster yellow &removed plants.  This year some of my flowers have shortened pink petals and also no petals and wrinkled leaves that I think is was due to cold spring and lots of rain. Last summer I had mite damage. Should I clean out my echinacea leaves in the fall to prevent problems? I have areas to dump the leaves away from my garden. I leave the seed heads for the birds and reseeding. How do I identify aster yellow infection vs mites? 

Thank you.

A lack of petals can be caused by multiple factors, not necessarily Aster Yellows; often, chewing by beetles (typically overnight) or other insects is the reason for missing petals. Wrinkled foliage could be due to early-season aphid feeding, spring cold snaps, or exposure to certain herbicide residues. (Viral infections are another possibility, but they would usually continue to cause worsening symptoms over time.)

Removing old foliage and plant debris over the winter might help to reduce some recurring pest and disease issues, but it won't necessarily have any impact on Aster Yellows, since leafhoppers that don't overwinter in Maryland tend to be the vector that introduces it to plants each year. (Some may overwinter, but it's the insects migrating or moving north on storm winds earlier in the season that tend to begin infections, as they already carry the pathogen in their bodies by that point, whereas leafhoppers that overwintered locally need to feed on an infected plant first.)

Ohio State has a useful article that compares Aster Yellows symptoms (on the flowers, since the mites in question don't damage leaves) with mite damage; we can share the link again here, and the same author has other articles that also showcase Aster Yellows symptoms. If the virus-like pathogen does manifest again this year as the cause of symptoms, then removing the entire plant (for affected individuals) is the only recourse. If the problem keeps occurring, there may be weeds or other plants in the area that the leafhoppers keep picking up the pathogen from, but since some can be asymptomatic, it can be hard to tell what the source of infection is in that case.

Miri