在此项研究中,所用的种薯材料系男爵品种,试验前都经过严格挑选和44℃恒温4小时的灭菌处理。进行了接种一个月而发生了明显典型病斑的病薯、在田间发病末期采集的病茎叶以及连茬地内的病菌的土壤越冬试验。从1960年12月末开始,将在田间越冬的病薯每隔半个月取回培养和镜检,均未发现病菌孢子囊。 In this study, the barley material used was Baron varieties, which were carefully selected and sterilized at 44 ° C for 4 hours before the test. Inoculated with a month of obvious typical lesions of potato disease, disease and stems and leaves in the late stage of disease incidence in the field of continuous winter soil test. Beginning from the end of December 1960, the disease-causing spores sacs were recovered from microscopy and microscopic examination every two weeks for the overwintering of potato in the field.