棉苗病害在我國所有植棉地區普遍發生,發病率一般為30—80%。每逢陰冷多雨之春,死苗常達三成,局部地區甚至被迫改種其他作物。如東北在1936、1938及1950三年因苗病而燬種的棉田各佔30萬畝;華北棉區僅以河北一省而言,1950年即燬種15萬畝。常年死苗雖少,而病苗甚多。根據調查研究:病苗生育各期,均顯著延遲,產量損失3—4成,足見苗病在增產中的危害性。 Cotton seedling disease occurs in all cotton planting areas in our country, the incidence rate is generally 30-80%. During the cold and rainy spring, dead seedlings often reach 30%, and some areas are even forced to switch to other crops. For example, in Northeast of 1936, 1938 and 1950, 30 million mu of cotton fields were destroyed due to disease and disease respectively. In North China, only 1500 in Hebei province was destroyed in 1950. Although there are few perennial dead seedlings, and many sick seedlings. According to the investigation and research, all stages of disease and seedling growth were significantly delayed with a yield loss of 3-4%, which indicated that the disease-causing disease was in danger of increasing yield.