Prevent root rot when bean pods blossom

First, the onset of symptoms mainly damage the base of the roots and underground stems. Occurrence of reddish-brown spots with water-stained spots, which later turn into dark brown or dark brown, slightly sunken, and sometimes the diseased part of the late disease is cracked or deteriorating. The main root is rotted or necrotic, the lateral roots are sparse, and the plants are dwarfed and easily pulled out. The vascular bundles of the rhizomes turn brown or dark brown, but they do not develop towards the ground (typical symptoms, different from blight). In severe conditions, the main roots are completely rotted and stems and leaves die. When wet, the stem base often has pink mold. Second, the occurrence of the law by the semi-known fungi subfamily, Fusarium genus Fusarium infestation. Mycelia and chlamydospores were used for wintering in sick bodies, manure and soil. Rely on soil, fertilisers, agricultural implements, rainwater and irrigation water. Invasion from the base of the root or underground stem. Onset temperature of 24 °C, relative humidity of 80%. It is hot and rainy, and there is stagnant water in the fields and the disease is heavy when the humidity is high. If there are many insect pests in the ground, and the density is large, the adult insects will have more wounds, which will facilitate the invasion of pathogens, apply organic fertilizers for diseased bodies, early sowing, continuous cropping of diseases, low-lying land, and heavy watering. Third, prevention and control measures 1, seedbed treatment: use a new seedbed or use Daejeon or carbon soil seedlings. Can also be used 50% carbendazim WP, or 50% benomyl WP or 75% dexcone wettable powder, 8 grams per square meter sterilized seedbed. 2. Daejeon disinfection: (live) before sowing or before planting, 50% carbendazim WP, 75% dexcone wettable powder, or 60% anti-virus Po WP 22 kg per mu, or 50% Benomyl wettable powder, 21.5 kg per mu, add 50 kg of fine soil, mix well and apply the soil into the seeding ditch or planting hole, then sprinkle a thin layer of fine soil, and then sowing or planting bean sprouts. 3, cultivation management: with cruciferous, Liliaceae crop rotation for 3-5 years, sorghum or semi-high sorghum cultivation, dredging earth. After the rain, timely drainage, watering should not be too much to prevent flooding irrigation, decompose organic fertilizer, increase phosphorus and potassium fertilizers, and strengthen loose soil weeding. The sickness was brought out of the field to be buried or burned in a timely manner, and the diseased planting hole was scattered around it to disinfect the quicklime. 4. Chemical control: When the disease just happened, use 70% thiophanate-methyl WP 1000 times solution, or 75% chlorothalonil WP 600 times solution spray, 7-10 days, spray 2-3 Times, focus on the stem base. The above-mentioned agents may also be used, or 12.5% ​​of Weiweiling Shui agent 200-300 times, or 60% of anti-mildew Bao WP 500-600 times, or of 50% carbendazim WP 500 times, or 70%. Dikesol WP 800-1000 times, or root rot 300 times Irrigation root, per plant (follicle) irrigation 250l, 10 days after irrigation.

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