black spot
noun
1
- Brit. a place or area marked by a particular trouble or concern麻烦频发地区：
an unemployment black spot
失业高发地区
an accident black spot.
事故多发地区。
2
- mass noun a fungal or bacterial disease of plants, especially roses, producing black blotches on the leaves（植物）黑斑病。
2.1
- Rose black spot is caused by the fungus Diplocarpon rosae, subdivision Ascomycotina.玫瑰黑斑病由蔷薇双壳菌（子囊菌亚门）引起。