Is this a chimera Echinacea? Mutation caused by virus, bacteria, or fungi? Please advise. Two separate queries by folks in Catonsville at the Wednesday Farmers Market were presented with these samples at the AMG Plant Clinic on September 12, 2018
These symptoms (phyllody, the leafy abnormal growth, and virescence, the green colored flowers) are caused by a phytoplasma disease called Aster Yellows and/or eriophyid mites. Leafhoppers spread the Aster Yellows pathogen. https://extension.umd.edu/hgic/aster-yellows-flowers
There is no cure for infected plants with these symptoms. We recommend that you remove and discard affected plants.
You can find additional information here: http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advi...