Hollyhock Rust This rust disease can result in serious injury to hollyhocks (Althaea spp.) and is found nearly everywhere they are grown. The rust also occurs on mallow (Malva rotundifolia), a common weed, which can serve as a disease reservoir for the fungus and contribute to infection of hollyhocks.ollyhock Rust This rust disease can result in serious injury to hollyhocks (Althaea spp.) and is found nearly everywhere they are grown. The rust also occurs on mallow (Malva rotundifolia), a common weed, which can serve as a disease reservoir for the fungus and contribute to infection of hollyhocks.
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