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通过大豆霜霉病病粒接种、孢子囊人工接种胚轴试验以及病苗徒手切片观察，揭示出大豆霜霉病为系统侵染病害。种子表皮下的卵孢子越冬后，萌发侵染胚轴，形成系统侵染。带病种子是翌年的主要初侵染源。通过不同温度下贮藏的种子，不同时期播种，发现温度对卵孢子的萌发和侵染影响很大，在室温下贮藏豆种以及适时播种可减少病害的发生与流行。不同品种的抗性试验表明，大豆品种间的抗病性差异显著，采用抗病品种是最有效的防治措施。通过对１９８３～１９８７年的病害调查，发现降雨造成的高湿度对病害影响很大，尤其是７月份的降雨量，是大豆霜霉病流行的关键因素。
Through inoculation of soybean downy mildew disease, artificial inoculation of sporangium and hypocotyls of seedlings, it was revealed that soybean downy mildew was a systematic infection disease. Oospores under the seed epidermis wintering and germinating and infecting the hypocotyls to form a systemic infection. Sick seeds are the major source of initial infection the following year. Through the storage of seeds at different temperatures and sowing at different times, it was found that temperature had a great influence on the germination and infection of oospores. Storage of beans and storage at room temperature could reduce the occurrence and prevalence of diseases. Resistance tests of different varieties showed that there was significant difference in disease resistance among soybean cultivars, and using resistant varieties was the most effective control measure. Through the investigation of the disease from 1983 to 1987, it was found that the high humidity caused by rainfall has a great impact on the disease, especially the rainfall in July, which is the key factor in the prevalence of soybean downy mildew.