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在鉴定棉花品种对枯、黄萎病抗病性的研究中,经常遇到的问题是如何合理地划分田间病情分级标准,以便正确地评定其抗性。已往,我们曾在试验中设计过两种分级标准,一种是级数较少(四级)的分级标准,另一种是级数较多(六级)的分级标准。试用的结果,在棉黄萎病品种抗病性鉴定中,明显地看出级数较多(六级)的分级标准具有较大的优点,有利于区分抗病、耐病或感病的品种品系和组合,可以根据它们的产量、
In the study of the cotton varieties’ resistance to the withered and Verticillium wilt diseases, the frequently encountered problem is how to reasonably divide the grading criteria of the field in order to correctly assess their resistance. In the past, we have designed two grading standards in the experiment, one grading standard with fewer grading (Grade 4) and the other grading standard with more grading (Grade 6). As a result of the trial, in the identification of the disease resistance of the varieties of cotton wilt, it is obvious that the grading standards with a large number of grades (six levels) have greater advantages and are good for distinguishing the strains resistant to, disease-resistant or susceptible And combination, according to their production,