在云南玉溪地区发现蚕豆茎秆扭曲,茎表皮破裂,有的植株顶部叶片卷曲,呈“菊花状”;植株能正常开花,但单枝结荚率很低,分枝空秆率明显增多。被称为“花而不实”症。经测定:病株平均含硼仅为5.29毫克/公斤,而健株为12.99毫克/公斤。前者比后者低59.3％同时,病株对应根际土壤水溶性硼平均为0.245毫克/公斤,而健株根际土壤的水溶性 In Yuxi, Yunnan, it was found that the stalks of Vicia faba tended to be distorted and the epidermis of stems ruptured. The top leaves of some plants were curly and “daisy-like”. The plants could flowering normally. However, the pod yield was very low and the percentage of stoma was significantly increased. Known as the “flower but not real” disease. It was determined that the average boron content of diseased plants was only 5.29 mg / kg while that of healthy plants was 12.99 mg / kg. The former was 59.3% lower than the latter. Meanwhile, the average soluble boron content of rhizosphere soil was 0.245 mg / kg, while that of healthy rhizosphere soil was