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Hollyhock rust damages leaves, stems, loquat leaves, and other green tissues of plants, resulting in leaves falling dead and falling. In severe cases, the whole plant died. Seriously affect plant growth and reduce ornamental value.
Symptoms: At the early stage of the disease, the affected leaf produces dorsal-sized spots on the back of the leaves. The spots are brown and verrucous. The lesions on the front of the leaves are slightly larger, bright yellow or orange, and the center is light red. In the later stage of the disease, the lesions occur more often and connect into pieces, causing the leaves to die and fall off. The brown ecchymosis in the dorsal disease area is the teliospores of the pathogen.
Pathogen: The pathogen is Puccinia malvaceanum Mont, which belongs to the basidiomycotina, cyperomycetes, rust, and rust bacterium.
Pathogenesis: The pathogen is a single host rusty bacterium, wintering spores in diseased deciduous wintering, the second spring, when the environmental conditions are appropriate, the spores germinate to produce spores, spores spread by wind and rain, germination invade the host for harm . In heavy rain or heavy nighttime, the disease is heavy.
Prevention: 1 reduce the source of infection: the removal of diseased leaves in a timely manner. After flowering, the diseased plants and the diseased bodies were completely removed and burned. 2 Select disease-free seeds on healthy plants. 3 Chemical control: In the early stage of onset, spray 15% triadimefon 1 000-fold wettable powder, or 65%-zein-zinc wettable powder 600-800 times, spray once every 7-10 days, spray 2-3 times.
Hollyhock also known as Ji Jihua, Duanwu Jin. It is hardy, cold and well-drained with fertile soil. It can be exposed to winter in open areas in North China. Hollyhocks are rich in color, they are large in size and strong in petals, and they are often planted or clustered in front of buildings in gardens. In addition, it can still be used for fringing greenery and potted plants. The purple pigment in petals is easily soluble in alcohol and hot water and can be used as a coloring agent for foods and beverages. Bark fibers can be used for linen. Whole grass medicine has the effect of heat and cooling.