So what can I do with the rust on my Hollyhocks?
burn them!!
sorry to be so blunt but it's inevitable that they will get rust, they always do. (or so i've learnt)
go and treat yourself to some new ones.
unless someone else has a miracle cure davidp
Hollyhocks are very susceptible to this disease hence the reason why lots of people treat them as an annual and get rid of them each year.
I would follow the advice already given................get rid!!