Broad bean is an important crop planted in Xiaochun County of our county. It has entered the branching stage one after another. It is a critical period for preventing and controlling diseases and preventing disease. In addition to selecting disease-resistant varieties, reasonable dense planting and pruning, and doing a good job of anti-drought drainage, Phosphorus and potassium fertilizers to increase, to increase the resistance of broad bean, chemical control is also necessary, the main diseases are: 1, root rot. It is a kind of fungal disease. After onset, the most obvious feature is that the leaf margins of the lower leaves of the plants turn black, and when the leaves are dark, the whole leaves become dark and scorch, which can reduce the production of broad beans by 30% and 50%. In terms of prevention and control, if the disease has already occurred, it can be timely mixed with phosphorous and potassium fertilizers or a ditch for burying in ash manure, and use 50% carbendazim or 70% thiophanate-methyl 1000-times liquid leaching, which has a good control effect. . 2, red spot disease. In the early stage of disease, small red spots appear on the leaves, and then gradually expand into round red spots. In warm and humid winter and spring, the lesions expand rapidly, the diseased leaves become withered, and finally die. Prevention and treatment of the disease should be taken to prevent the disease by taking rotations, draining water, adding phosphorus and potassium fertilizers, or using tree ash, fire and earth ash. Chemical control can be sprayed with 50% carbendazim 100 g or 70% thiophanate-methyl 70-g water 50 kg. 3, rust. In winter and spring, the disease is more severe in warm and humid weather. First invade the old leaves of the base, and then invade the stems and calyx of the young leaves. After onset, it is generally possible to reduce the production of vicia faba by 10% or 20%, and the larvae become black and partially rotten after being victimized. It is difficult to sell fresh broad beans, affecting the yield and affecting the quality. The prevention and treatment should promptly remove the burned diseased plants and use triadimefon 600-800. The liquid is sprayed at the early stage of disease, and the effect is best when it is controlled 1-2 times. Combined with the removal of the top heart of the broad bean, it can promote the growth of more beans. 4, dry dead stem disease. This is a physiological disease caused by waterlogging. There is more rain in spring, especially in the case of faba bean flowering and podging. In case of rainy weather, poor drainage leads to root rot. Attention should be paid to clearing gutter drainage in order to reduce rhizosphere water damage.
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