At present, in Changqing and other places, the cowpea planted with mulching film has a wide range of withered symptoms. It is necessary to prevent and control the damage in time and reduce the loss. Fusarium wilt disease usually starts from the early stage of flowering. The diseased plants first yellowed from the lower leaves and gradually expanded toward the upper leaves. When the lower middle leaves turned yellow, all the plants suddenly withered, or they became fine after the rain and watered and then met the sunny day. The diseased plants wilted and died, and the diseased stem bases and The internal root vascular tissue becomes brown or dark brown. In severe cases, the diseased department became dark brown and the roots rotted. When the humidity is high, the diseased area shows a pink mold layer. Fusarium wilt is a kind of soil-borne disease. It is prone to spread when the soil temperature is 27°C-30°C and the soil is acidic. For many years, the incidence of high temperature and high humidity is heavy. Control methods: 1. Selection of resistant varieties: such as early Tsui, 901, Zaofeng 3 and other varieties more resistant to wilt and resistance to wilt. 2. Implement three years or more rotations. 3. Seed disinfection: Seed dressing with 0.4% 50% carbendazim WP of seed weight, soaking in warm water at about 25°C for 4-6 hours, and then soaking 20-30 in formalin 300 times Minutes, then rinse with water, germinate or sow germination. 4. Disinfection of the soil water before planting: Pulk, Hymexazol, DT, DTM, Double Effect Spirit, benomyl and other drugs can be used. 5. At the beginning of the disease, “spray and spray†the plants: spray some foliar fertilizer and 0.2% detergent. Irrigation can be used with a single agent or rotation, the use of a variety of drugs: hymexazol, DT, DTM, double effect Ling, methyl-toxin, a strong benomyl and so on. 6. The diseased leaves should be removed in time, and they should be buried deep outside the field. When the diseased plant is serious, it can be set aside and the strains can be disinfected with quicklime. 7. Do a good job of fertilizer and water management, and cultivate strong plants: water to avoid high temperature, small water pouring, to avoid flooding irrigation, hot water in time with a small well water pouring once. When irrigating with water, fertilizer, ternary compound fertilizer can be 15 kg per acre. Spray foliar spray, urea, potassium dihydrogen phosphate and other foliar fertilizers to prevent premature aging.
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