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Horticulture and Home Pest News
Horticulture & Home Pest News is filled with articles on current horticulture, plant care, pest management, and common household pests written by Iowa State University Extension specialists in the Departments of Entomology, Horticulture and Plant Pathology.

Hollyhock Rust

This article was published originally on 5/26/1993
Hollyhock rust is caused by the fungus Puccinia malvacearum. The rust fungus causes raised brown spots, usually pinhead-size or larger, on the undersides of leaves. The upper leaf surface shows orange to yellow spots. The raised spots may coalesce, killing larger areas of leaves.

Control: Remove diseased leaves. After flowering, cut the plant back to the base and destroy infected plants parts. Fungicides, such as chlorothalonil (Daconil 2787), are effective against rust but frequent applications are necessary to protect newly emerging leaves.



This article originally appeared in the May 26, 1993 issue, p. 79.

Year of Publication: 
1993
Issue: 
IC-465(13) -- May 26, 1993