downy mildew of soybean

例句：

1. 1. The farmers are concerned about the damage caused by the downy mildew of soybeans.
   农民们担心大豆的霉病造成的损害。
2. 2. The disease is a major threat to the production of soybeans.
   这种疾病是大豆生产的主要威胁。
3. 3. To control the spread of the downy mildew of soybeans, farmers need to use resistant varieties.
   为了控制大豆霉病的传播，农民需要使用抗病品种。