杨苗黑斑病是世界性的杨树幼苗叶部病害,它不仅侵染叶部引起早期落叶,还能侵染嫩茎、果穗,严重时造成育苗失败。 本文对杨苗黑斑病的病原菌种类、专化型、寄主范围、致病性及其分离、鉴定方法;各类寄主、不同期寄主所表现出的症状;侵染循环及发病规律都进行了系统的阐述。并且在此基础上提出了通过对苗木、种子进行检疫,用苯来特、福美双等杀菌剂处理带菌种子防治杨苗黑斑病等一系列合理的防治措施。 Yang Miao black spot is a worldwide poplar seedling leaf disease, which not only affects the leaves early inflorescence leaves, but also infected with tender stems, ears, causing serious nursery failure. In this paper, the pathogen species, specialization type, host range, pathogenicity, isolation and identification methods of black spot disease of Yang Miao were studied. The symptoms of various hosts and hosts at different stages, the cycle of infection and the pathogenesis were also studied System elaboration. On the basis of this, a series of reasonable control measures, such as quarantine for nursery stock and seed, and prevention and cure of black spot of poplar seedlings by using benzol, thiram and other fungicides, were put forward.