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Main diseases identification and prevention methods of broad beans
Broad bean planting is widespread, and it has become one of the major planting species in spring crops. However, many growers do not pay attention to the prevention and control of broad bean diseases, which results in a decrease in yield of broad bean, which occurs in some parts of the country. The main diseases are blight, root rot, red spot, and rust. The main symptoms are as follows: Blight: Most of them are in poorly-drained, low-humid fields, and occur under low-temperature and rainy conditions. The roots and bases of stems are damaged. Spots have a reddish-brown color that turns brownish-black. The rotten roots have yellow-brown hyphae and have sclerotia that are connected to each other. Root rot: The low-lying fields with waterlogging or nitriding fertilizers are all prone to the disease. The disease is severe during the seedling and middle stages. The disease invades the base of the roots and stems and causes it to turn black and rot and eventually leads to death. Red spot disease: It mainly damages leaves, stems and flowers. The affected leaves are reddish-brown small round spots with purple-brown edges. Severe leaves fall off and die. Rust: The whole plant can be affected. The leaves are the most important. The leaves are the most important. The yellow spot first appears in the affected area and then turns into red and yellow spots. It finally turns into a red-brown spot. The disease is prone to occur under cloudy and rainy conditions. And die. Agricultural control methods: 1, Qinggou drainage, so that energy can be discharged without irrigation, heavy clay field to loose soil. 2. The potassium-depleting fields are increased with organic fertilizers and potash fertilizers. Generally, 100 kg of Mushi ash or 10-15 kg of potassium sulphate are used for plant growth to enhance the resistance. 3, when the disease occurs, immediately remove the diseased plants, do not throw at the edge of the field or ditch, etc., and disinfection of diseased litter. Pharmaceutical control methods: 1, the early onset of the mu with 65% zixi zinc WP 50 grams of water 50 kg spray. 2, mu with 0.5% lime water 50 kg spray. 3, mu with 70% thiophantine powder 100 g water 75 kg spray, or spray with 50% carbendazim 800 times.