蚕豆根腐病属土传病害,一些地区重茬种植的低洼土质黏重的蚕豆,发病比较严重,造成一片一片枯死。主要为害根部和地表以下的茎基部。被害后,初呈水渍状,后变深褐色或黑色腐烂,到了发病后期,根部大部分干缩,地上部蚕豆植株下部的叶片边缘出现黄色斑点,以后叶片变黑枯死,最后植株一般萎蔫死亡。在病部腐烂处的维管束变黑 Vicia faba root is a soil-borne disease, some areas planted low-lying soil sticky heavy beans, the incidence is more serious, resulting in a piece of dead. Main damage to the roots and below the surface of the stem base. After being killed, the plants showed the shape of water-stain at first, and later became dark brown or black decay. At the later stage of disease, most of the roots were shrunken. Yellow spots appeared on the edges of the lower part of broad bean plantlets above the ground and the leaves became black and dead. . Department of vascular decay in the Department of vascular darkness