种子带菌是棉花黄萎病和枯萎病远距离传播的病菌来源。据仇元、段应科等研究,用黄萎病病株棉籽在消毒土壤內栽培,发病率为27.3%。用枯萎病区种子作为消毒土壤接种剂,种植棉花,发病率为40.8—95.3%。一九五九年以前,陝西武功头道塬旱地棉花并无黄、枯萎病。自一九五九年由病区調用“517”品种以后,田间病株逐年加多。头一年,田間仅有零星黄、枯萎病病株。嗣后数 Seed-borne bacteria are sources of bacteria that spread long-term between Verticillium dahliae and Fusarium wilt. According to Qiu Yuan, Duan Yingke and other research, with Verticillium wilt cotton seed in sterile soil cultivation, the incidence was 27.3%. Fusiform wilt seeds were used as disinfecting soil inoculants to grow cotton with the incidence of 40.8-95.3%. Before 1959, there was no yellow or wilt disease in dryland cotton of Wugong Taudao Plateau. Since the “517” variety was called by the ward in 1959, the number of disease in the field has increased year by year. The first year, the field only sporadic yellow, wilt disease. Subsequent number