black root rot

例句：

1. 1. The roots of thetree are black and rotten, indicatinga serious disease.
   这棵树的根部是黑色的，腐烂了，表明这是一种严重的疾病。
2. 2. The black root rot has spread throughoutthe forest, causing significant damage to theecosystem.
   黑根腐病已经在整个森林中蔓延开来，对生态系统造成了重大损害。
3. 3. Experts are working on developingnew treatments for this devastating disease.
   专家们正在努力开发新的治疗这种毁灭性疾病的方法。