stem rot of beet

例句：

1. 1. The plant's stem was severely affected by the disease.
   植物的茎严重受到了这种病的影响。
2. 2. The farmer noticed that the corn stalks were turning brown and rotting.
   农民注意到玉米秆开始变黄并腐烂了。
3. 3. The researcher found that the roots of the tree had begun to rot due to lack of water.
   研究人员发现由于缺水，这棵树的根已经开始腐烂。