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20世纪70年代以前,水稻稻曲病[Ustilagin-oidea virens(Cke.)Tak.]在汉中地区较少发病,80年代杂交稻晚熟组合大面积推广后,发病明显加重。
Before 1970s, Ustilagin-oidea virens (Cke.) Tak. Was less susceptible to disease in Hanzhong area and the disease was significantly aggravated when it was widely spread in late 1980s.