The bean root rot primarily harms the roots and base of the plant and invades the wound. High temperature, heavy rain, high water content in the field, and high humidity. At the beginning of the disease, water-stained reddish-brown spots appeared in the diseased area, and later became dark brown or dark brown, slightly sunken or cracked; the main root was rot or necrotic, the lateral roots were few, and the plants were dwarfed and easily pulled out. In severe conditions, the main roots are completely rotted and stems and leaves are dead. When wet, pink molds appear on the stem base.
Prevention
Seedling treatment The fields not grown with kidney beans are grown on Daejeon soil. Use 50% carbendazim WP, 50% benomyl wettable powder or 70% dexcone wettable powder 8g per square meter nursery.
Cultivation and management of Cruciferae and Liliaceae crop rotation for 3-5 years, sorghum or semi-high sorghum cultivation; hoeing and hoeing, loose soil weeding; timely drainage after rain, can not flood irrigation; application of organic fertilizer, increase phosphorus and potassium fertilizers; Timely removal of diseased plants and out of the field buried deep or burned, diseased areas and disinfected with lime around.
When the chemical is used to prevent the onset of disease, use 70% thiophanate-methyl WP 1000 times or 75% chlorothalonil WP 600 times to spray on the stem base. Spray every 7-10 days for a total of 2-3 injections. Or use 12.5% ​​of Weiwei Lingzhi 200 to 300 times liquid, 60% anti-mildew Po WP 500 to 600 times, 50% carbendazim wettable powder 500 times, 70% Dukesson WP 800?1000 times liquid, root rot 300 times and other irrigation roots, irrigation 10 days later.
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