Observation 118363: Puccinia malvacearum (Bertero ex Montagne 1852)

When: 2012-11-26

Collection location: University of California Berkeley (UC Berkeley), Berkeley, California, USA [Click for map]

Who: BretP

No specimen available

Kingdom- Fungi
Phylum- Basidiomycota
SP- Pucciniomycotina
Class- Pucciomycetes
Order- Pucciniales
Family- Puccinaceae
Genus- Puccinia
Species- malvacearum

Also known as “Hollyhock Rust.” Although it has many more hosts than just hollyhock, this fungus is autoecious (requiring one host to complete its life cycle). Brownish pustules will develop beneath the leaves of the plant it infects. It will persist through winter on the host and reinfect new tissue when available. The spores are wind dispersed. A major property of this rust is that it’s microcyclic (teliospores are the only binucleated spore stage in the life cycle).

Proper sanitation is key to preventing hollyhock rust. There is a strong association between the time a leaf is wet and infection. Ensure adequate air circulation so that your plants can dry and leave space between your plants. If your plant gets infected, remove the infected leaves and burn them. Mulch can help prevent the disease overwintering at their base.

Other plants this can infect:
Rose Mallow, Tree Mallow, False Mallow, Flowering Maple, and Musk Mallow.


Promycelium of teliospore with visible sterigmata and a basidiospore.
Macro picture on leaf
Life Cycle

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Created: 2012-11-30 00:09:32 EST (-0500)
Last modified: 2013-07-22 16:07:04 EDT (-0400)
Viewed: 301 times, last viewed: 2018-04-03 06:21:33 EDT (-0400)
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