Posted: 09/12/2016 at 18:53
Thanks nut, I always thought it was viral rather than fungal! Just looked up the offending fungus on the RHS site and see it affects several other plants in the family. They say get rid of all other susceptible plants if hollyhocks are your main 'thing':
I might try them again one year but, like black spot infected roses, I hate the sight of diseased plants and don't have enough border space to hide the worst affected parts so will probably resign them to the list of ne'er do wells!