potato early blight

例句：

1. 1.The potato crop was severely affected by the early blight.
   由于早疫病，土豆作物受到了严重影响。
2. 2. Early blight is a major threat to potato crops in the spring.
   早疫病是春季土豆作物的主要威胁。
3. 3.Farmers need to take preventive measures against early blight to protect their crops.
   农民需要采取预防措施来保护他们的作物免受早疫病的侵害。