leaf spot

例句：

1. 1. The tree's leaves have developed a leaf spot that is spreading rapidly.
   这棵树的叶子上出现了一种快速蔓延的叶斑病。
2. 2. The farmer noticed the unusually large leaves on his apple trees and suspected a leaf spot.
   农民注意到他的苹果树上叶子异常大，怀疑是叶斑病。
3. 3. To prevent the spread of leaf spots, it is important to regularly inspect and treat your plants.
   为了防止叶斑病的传播，定期检查和治疗你的植物是很重要的。