tobacco downy mildew

例句：

1. 1. The outbreak of tobacco downy mildew has affected the entire region's crops.
   烟草灰霉病的爆发影响了整个地区的农作物。
2. 2. The farmers are trying to control the spread of tobacco downy mildew by using resistant varieties.
   农民们正试图通过使用抗病品种来控制烟草灰霉病的传播。
3. 3.Due to the high humidity and temperature conditions in the area, tobacco downy mildew is prevalent.
   由于该地区的高湿度和温度条件，烟草灰霉病很常见。