棉苗根病是常发性病害,严重影响苗全苗壮。晋南棉区五十年代发病率、病情指数分别为43.3％和22.2％,六十年代为42.7％、24.3％,七十年代为88.2％、44.4％,八十年代为99.9％、41.9％。棉苗根病是复合性病害,有人认为晋南南部主要是炭疽病,北部主要是立枯病;有的认为南部主要是红腐 Cotton seedling root disease is a common disease, seriously affecting the seedlings Zhuang Zhuang strong. The incidence and disease index of Jinnan cotton area in the 1950s were 43.3% and 22.2% respectively, 42.7% and 24.3% in the 1960s, 88.2% and 44.4% in the 1970s and 99.9% and 41.9% in the 1980s. Cotton seedling root disease is a composite disease, some people think that southern Shanxi is mainly anthracnose, the main fall blight in the north; some believe that the southern red rot