白菜霜霉病菌(Peronospora parasitica)卵孢子是主要的越冬器官,但有关病菌卵孢子形成及其生活力的报导并不多见。根据在沈阳田间调查的结果,1958年在田间采集秋白菜霜霉病病叶时发现病斑内含有大量的病菌卵孢子,1961年又见到同样的情况,这两年都是沈阳地区白菜霜霉病的流行年。为进一步了解这些情况,于1962年秋季对病菌卵孢子在田间的形成时期作了较系统的调查。 Oocysts of Peronospora parasitica are the major overwintering organs, but few reports on the spore formation and viability of the pathogens are rare. According to the results of the field survey in Shenyang, 1958 in the field collected autumn leaves of autumn cabbage downy mildew disease found in the lesion contains a large number of bacteria spores, in 1961 to see the same situation, both in the past two years cabbage cream in Shenyang Mildew epidemic years. To further understand these conditions, in the fall of 1962, a more systematic investigation of the conidia of sporozoites in the field was carried out.