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对采集到的大豆疫病１８个样本分别进行了分离纯化和形态鉴定，结果表明：该地区大豆疫病是由疫霉属大豆疫霉菌（Ｐｈｙｔｏｐｈｔｈｏｒａｍｅｇａｓｐｅｒｍａ）引起，经过致病性测定，发病率为１００％。
Eighteen samples collected from the soybean blight were isolated and purified respectively. The results showed that the soybean disease in this area was caused by Phytophthora megasperma, and the incidence was 100% after the pathogenicity test.