Helminthosporium leaf spot

例句：

1. 1.The disease is caused by a fungus that lives on the leaves of plants.
   这种疾病是由一种生活在植物叶子上的真菌引起的。
2. 2. The farmer sprayed the crops with a chemical to prevent this disease from spreading.
   农民用一种化学物质喷洒作物，以防止这种病蔓延。
3. 3.The plant pathologist identified the Helminthosporium leaf spot as the cause of the damage.
   植物病理学家确定了线虫霉叶斑病是造成损害的原因。