foliage disease

例句：

1. 1. The outbreak of the leaf disease has affected many apple trees.
   叶部病害的爆发已经影响了许多苹果树。
2. 2.The farmers are worried about the spread of the leaf disease in their orchards.
   农民们担心叶部病害在他们的果园里传播。
3. 3. To prevent the spread of the leaf disease, the authorities have implemented strict quarantine measures.
   为了预防叶部病害的传播，当局实施了严格的检疫措施。