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据各地资料反映,今年棉花枯萎病是一个暴发年。河南安阳、山东惠民、河北晋县、山西运城调查表明,发病程度均较历年为重;四川简阳报告,即使是抗病或耐病品种发病株率亦较高;浙江慈溪前期考查,感病品种发病株率较去年成倍增加。本所试验地发病株率由去年的20～30%,增到70～90%,死苗率从10%增到40%。探讨棉花枯萎病暴发的规律,如何防止暴发和减少大暴发给棉花生产带来的损失,在科研和生产上引起了大家十分关注。现就孔见所及,谈谈有关选种、引种方面的问题。一、转害为利,从病区大搞选种根据多年育种实践分析,在任何一个感病品种的群体中,个体之间的抗性是有差异的,加上棉花是遗传基础复杂的常异花授粉作物,因此,绝对纯的棉花品种是没有的。通过枯萎病大暴发的严酷考验,在一个品种中必有少数“优胜者”,相对地较耐病或抗病。因此,不能“埋没人才”,要把那些抗病和耐病的单株选拔出来,混收种于种子田或
According to data from all over the country, cotton blight is an outbreak this year. Anyang in Henan Province, Huimin in Shandong Province, Jin County in Hebei Province and Yuncheng City in Shanxi Province showed that the incidence was heavier than in previous years; the report of Jianyang in Sichuan showed that the incidence rate of disease-resistant or disease-resistant varieties was also high; The incidence rate of plants doubled from last year. The rate of the tested plants increased from 20-30% in last year to 70-90% and the rate of dead seedlings increased from 10% to 40%. To investigate the law of cotton wilt outbreak, how to prevent the outbreak and reduce the outbreak caused by the loss of cotton production, in research and production aroused everyone’s attention. Now I see on the hole, to talk about the selection, introduction of the issue. First, the transfer for the benefit, from the ward to engage in the selection According to many years of breeding practice analysis, in any one susceptible variety of groups, there is a difference between the resistance of individuals, coupled with the genetic basis of cotton is often complex Cross-pollination crops, therefore, are absolutely pure cotton varieties are not. Through the harsh test of the blight outbreak, there must be a handful of “winners” in one breed, relatively more resistant or resistant to disease. Therefore, we should not “bury our talents.” We should select those resistant and disease-resistant plants and plant them in the seed fields or