Medicinal Plant Mallow Sclerotinia

Mallow scientific name Malva verticillata L, alias winter leeks, winter cold dishes, slippery vegetables, soil yellow peony, leeks and leeks. It is an annual herb of Malvaceae. Roots, stems, leaves and seeds are used as medicine. With diuretic milk, laxative, heat and dampness, Bu Zhong Yi Qi and other effects. Jilin, Liaoning, Hebei, Shaanxi, Gansu, Qinghai, Inner Mongolia, Jiangxi, Hunan, Sichuan, Guizhou and Yunnan have all been cultivated.

Symptoms of strains are susceptible to disease, mainly stem damage. At the early stage of disease, lesions on the stems began to be water-stained and turned brownish. The disease minister produced white hyphae and oblate sclerotia. The infected stems were covered with white hyphae, causing soft cortical rot and stalk fragmentation. The stalks are hollow, and sometimes sclerotia are visible. When the stems are damaged, the branches are wilted and gradually die. The pathogen Sclerotinia sclerotior μm (Lib.) de Bary called Sclerotinia sclerotiorum, belonging to the genus Ascomycota spp. The nucleus is oblate and smaller.

Transmission routes and pathogenic conditions The pathogenic bacteria mixed in the seed or in the soil left overwintering became the source of infestation early in the year. Ascospores are produced in the growing season and reinfested by wind and rain spreading and spreading. Entering the rainy season is prone to disease. High density, partial application of nitrogen fertilizer, heavy rain in the fields after the rain became heavy.

Control methods (1) Sprouting sclerotia between seeds before sowing. (2) Strengthen field management, appropriate density, maintain ventilation and light transmission, apply compost or decomposed organic fertilizer made by Japanese enzyme bacteria, reduce nitrogen fertilizer, increase phosphorus and potassium fertilizers, and increase plant resistance to disease. (3) If necessary, spray 40% sclerotium net wettable powder 500 times liquid or 50% benomyl wettable powder 1500 times liquid, every 7-10 days, control 2-3 times. The drug was stopped 3 days before harvest.

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