Hollyhock Rust - Wisconsin Horticulture
网页Hollyhock rust is the most common fungal leaf disease of hollyhocks (Alcea rosea). Many other ornamentals (e.g., flowering maple, rose mallow) and weeds (e.g., common mallow) in the mallow family are also susceptible. Hollyhock rust can quickly spread, causing stunting of plants and premature leaf drop.
What Is Hollyhock Rust Disease - Gardening Know How
网页2023年2月21日 · Caused by the fungus Puccinia heterospora, hollyhock rust is a disfiguring disease that infects members of the Alcea (hollyhock) family. It begins as yellow spots on top of the leaves with rusty pustules on the undersides.
Hollyhock Rust: ID and Treatment - Epic Gardening
网页2024年7月15日 · Hollyhock rust is a fungal disease that readily spreads among these warm-season bloomers. Once it sets in, it is difficult to mitigate, but not all is lost. Here, garden expert Katherine Rowe looks at how to identify and treat the …
Hollyhock rust: how to prevent it, according to the experts
网页2023年4月11日 · The fungus that causes hollyhock rust overwinters on infected leaves and plant debris ready to release more spores in spring, says Anne Swithinbank, a gardening expert. Even if the plants don't show signs of rust in their first year of growth, they often will in their second, when they put on their floral display.
网页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.
Hollyhock Rust - Yard and Garden
网页Puccinia malvacearum, the rust fungus that infects hollyhock, causes yellow spots on the upper leaf surface, and orange-brown raised pustules on the lower leaf surface. Wet conditions promote infection by the rust fungus. The lower leaves typically show symptoms first, and the disease slowly progresses to upper leaves over the summer.
Hollyhock: Rust | Hortsense | Washington State University
网页2024年6月5日 · Hollyhock rust is caused by a fungus that overwinters in basal leaves which may live through the winter, or on plant debris. Spores remain viable for at least four months in the soil. Reddish, raised spots develop on leaf undersides, and then darken late in the growing season.
Hollyhock Rust | Plant Disease Diagnostics Clinic
网页2015年7月24日 · Hollyhock rust is the most common fungal leaf disease of hollyhocks (Alcea rosea). Many other ornamentals (e.g., flowering maple, rose mallow) and weeds (e.g., common mallow) in the mallow family are also susceptible. Hollyhock rust can quickly spread, causing stunting of plants and premature leaf drop. In …
Hollyhock rust / RHS
网页What is hollyhock rust? Hollyhock rust is a fungal disease of the aerial parts of the plant, caused by Puccinia malvacearum. It is spread by airborne spores. The disease will invariably develop on untreated hollyhocks, although it is worse during wet summer weather. Leaves, stems and calyces (outer parts of the flower) can all be attacked.
网页Hollyhock rust is the most common fungal leaf disease of hollyhocks (Alcea rosea). Many other ornamentals (e.g., flowering maple, rose mallow) and weeds (e.g., common mallow) in the mallow family are also susceptible. Hollyhock rust can quickly spread, causing stunting of plants and premature leaf drop. In rare instances, hollyhock rust can ...