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江苏省赣榆县大面积杂交稻不育 V_(41)A 制种、繁殖生产中,出现一种毁灭性的病害一稻粒黑粉病,受害田块产量损失4—5成,严重田块8成以上。收获时孢子散落,黑粉遍及整个田块。据调查分析,稻粒黑粉病的发病原因是:(1)品种的感病性。稻株对粒黑粉病的感染性是由品种基因所决定的。在同样的气候条件,相似的生态环境中,杂交稻不育系 V_(41)A 罹病最重,而处于同一田块中的父本 IR26则完全不感染。常规稻的病穗率也很低。从开花习性上看,感病品种的颍壳张开
In Ganyu County, Jiangsu Province, a large-area hybrid rice sterile V_ (41) A seed production, breeding production, there is a devastating disease of rice powdery mildew disease, yield loss of field plots 4-5 percent, serious plots More than 80%. Spores scattered when harvesting black powder throughout the plots. According to the survey analysis, the incidence of rice powdery mildew causes are: (1) the susceptibility of varieties. Infectivity of rice plants to powdery mildew is determined by the variety of genes. In the same climatic conditions and similar ecological environment, V_ (41) A, the male sterile line of hybrid rice, suffered the most severe disease while the female parent IR26 in the same field had no infection at all. The disease panicle rate of conventional rice is also very low. From the flowering habits point of view, the susceptible species of Ying shells open