black stem rust of wheat

例句：

1. 1.The black stem rust of wheat is a major threat to the crop.
   小麦的黑穗病是农作物的一大威胁。
2. 2. Farmers need to take measures to prevent the spread of this disease.
   农民需要采取措施防止这种病害的传播。
3. 3. The black stem rust of wheat can cause significant yield losses in affected areas.
   小麦的黑穗病会导致受影响地区的产量损失严重。