Garden Pests and Diseases: Sick Dahlia, 3 by Dmey

Dmey wrote:
Thanks. I have that problem on a couple of dahlias. Ive been spraying all of them with baking soda and dishwasher solution and this one ive sprayed with a copper fungicide. I think they are a little better. Im worried it might be a virus but i dont know how to tell and dont know if im wasting my time and putting my other plants in danger. How can i tell if its a virus? To be honest , i cant tell the diference from inages in the web bewteen virus and fungus etc.. Here are a couple more pictures.