celery leaf spot

例句：

1. 1. The celery leaf spot has been a major problemfor farmers in the region.
   芹菜叶斑病一直是该地区农民的主要问题。
2. 2. The diseaseis spread by insects and can cause severedamage to the plant.
   该疾病通过昆虫传播，并可严重损害植物。
3. 3. Toprevent the spread of the celeryleaf spot, farmers must use proper irrigation practices.
   为了防止芹菜叶斑病的传播，农民必须使用适当的灌溉方法。