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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 ]
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.
A leaf spot is a limited, discoloured, diseased area of a leaf that is caused by fungal, bacterial or viral plant diseases, or by injuries from nematodes, insects, environmental factors, toxicity or herbicides.
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]
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Research indicates, the higher the foliar disease severity, the greater the return from the use of fungicides. [25] Southern corn rust disease, can be confused with common rust. Southern rust's distinguishing characteristic is that pustules form mostly on the upper leaf surface and spores are more orange in color.
Wilt itself is the most common symptom, with wilting of the stem and leaves occurring due to the blockage of the xylem vascular tissues and therefore reduced water and nutrient flow. In small plants and seedlings, Verticillium can quickly kill the plant while in larger, more developed plants the severity can vary.