black rot of cabbage

例句：

1. 1. The blackrot of cabbage is a seriousthreat to the health of farmers.
   白菜黑腐病对农民的健康构成严重威胁。
2. 2. Theblack rot of cabbage has beenfound in many parts of the world.
   白菜黑腐病在世界许多地方都有发现。
3. 3. Toprevent the spread of black rot of cabbage, farmers need to use properfertilizers and watering techniques.
   为了防止白菜黑腐病的传播，农民需要使用适当的肥料和灌溉技术。