Hessian fly

例句：

1. 1.The farmer had to deal with the Hessian fly infestation on his farm.
   这位农民不得不处理农场上的黑头粉虱问题。
2. 2.The pest control company used a chemical spray to kill the Hessian fly.
   这家害虫控制公司使用了一种化学喷雾来杀死黑头粉虱。
3. 3.The farmers were worried about the spread of the Hessian fly in their fields.
   农民们担心这种黑头粉虱在他们田里扩散。