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以甘蓝根肿病为调查对象,比较分析了0~9级标准和0~4级标准的可行性和准确性.本调查研究选取3块发病地块,各随机抽取40株不同发病程度的甘蓝植株,应用2种分级标准统计分析了各自的病情指数及与甘蓝产量的相关性,探讨了以肿大主根和茎基部直径倍比、肿大侧根比例作为病害分级依据的可靠性,以及肿根其他症状(龟裂、变黑和腐烂)是否可作为分级的参考特征.研究结果表明,0~9级标准和0~4级标准与甘蓝产量损失之间均显示出很高的相关性,其中0~4级标准相关性更强;而肿根龟裂、变黑及腐烂等症状不能很好地区分不同病级,因此不适宜作为甘蓝根肿病田间分级的参考因素.
In order to investigate the clubroot disease of cabbage, the feasibility and accuracy of 0 ~ 9 standard and 0 ~ 4 standard were compared and analyzed.Three polluted land plots were selected in this investigation and randomly selected 40 cabbage Plants, the application of two grading standards statistical analysis of their disease index and the correlation with the yield of cabbage, to discuss the root and enlargement of the root diameter ratio, the ratio of enlarged lateral root as a disease grading reliability, and the swollen root Whether the other symptoms (cracking, blackening and decay) could be used as a reference for grading.The results showed that there was a high correlation between 0 ~ 9 standard and 0 ~ 4 standard and cabbage yield loss, among them 0 to 4 standard correlation stronger; and cracked root, cracked black and rot and other symptoms can not distinguish between different grades well, it is not suitable as a cabbage clubroot field grading reference factor.