Q.Black eyed susans
My black eyed Susan’s flower petals have turned green on some plants. Do I need to fertilize them?
MichiganDot
Answered on September 19, 2017
Your plant appears to be suffering from "aster yellows". It is an infection typically spread by leaf hoppers. If you are within a month of your first frost, I'd cut the plant to the ground and make sure every bit of it is tossed out. It might be a mite, too. Here is comprehensive info: http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/help-for-the-home-gardener/advice-tips-resources/pests-and-problems/diseases/viruses/aster-yellows.aspx
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