What is wrong with my hollyhocks if they are covered in orange bumps?

My hollyhocks are covered in orange bumps. What could be wrong with them?
Submitted by BHGPhotoContest

It sounds as though your plants have rust, a widespread and serious fungal disease of hollyhocks (Alcea). Spores of the fungus can spread through splashing water or on air currents. The fungus also survives on cheeseweed, or mallow (Malva). Remove nearby cheeseweeds; water your hollyhocks only early in the day to allow the foliage to dry overnight; and remove and destroy affected plant parts to slow the spread of the disease. Protective fungicide sprays will also help.


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