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前言目前育种工作者对于甜菜叶部病害的鉴定,通常采用病情指数法,即在发病盛期对育种材料进行1～2次调查.这种方法把材料感病的普遍程度和严重程度结合在一起,对病害的鉴定有一定作用.但是,在以小区为单位进行比较鉴定时,由于甜菜的育种工作
Preface At present, breeders often apply the disease index method for the identification of diseases of sugar beet leaf, that is, investigate the breeding materials 1 or 2 times during the peak growing period, which combines the prevalence and severity of material susceptibility , The identification of the disease has a certain effect.However, in the community as a unit for comparative identification, due to the breeding of sugar beet