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Puccinia malvacearum, also known as hollyhock or mallow rust, is a fungal species within the genus Puccinia known for attacking members of the family Malvaceae. An autoecious pathogen, it can complete its life cycle using a single host. It was originally found on the leaves of a species of Malva in Chile. [3]
Alcea rosea, the common hollyhock, is an ornamental dicot flowering plant in the family Malvaceae. It was imported into Europe from southwestern China during, or possibly before, the 15th century. [2] William Turner, a herbalist of the time, gave it the name "holyoke" from which the English name derives.
Alcea rugosa, the Russian hollyhock, is a species of flowering plant in the family Malvaceae. It is native to Ukraine, Crimea, south European Russia, and the Caucasus, and has been introduced as a garden escapee into Wisconsin and Maryland in the United States. [1] It is resistant to Puccinia malvacearum rust, and hardy to USDA zone 4. [2]
Rust fungi grow intracellularly, and make spore-producing fruiting bodies within or, more often, on the surfaces of affected plant parts. [3] Some rust species form perennial systemic infections that may cause plant deformities such as growth retardation, witch's broom, stem canker, galls, or hypertrophy of affected plant parts.
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Many of the problems affecting roses are seasonal and climatic. [1] Some varieties of roses are naturally more resistant or immune than others to certain pests and diseases. Cultivation requirements of individual rose species and cultivars, when observed, often assist in the prevention of pests, diseases and disorders. [2]
Alcea is a genus of over 80 species of flowering plants in the mallow family Malvaceae, commonly known as the hollyhocks. [1] They are native to Asia and Europe. [ 1 ] The single species of hollyhock from the Americas, the streambank wild hollyhock , belongs to a different genus.
Malva alcea (greater musk-mallow, cut-leaved mallow, vervain mallow or hollyhock mallow) is a plant in the mallow family native to southwestern, central and eastern Europe and southwestern Asia, from Spain north to southern Sweden and east to Russia and Turkey.